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In order to meet the data storage and access needs of coal mine personnel precise positioning system based on new positioning technologies such as UWB, the data structure, sampling frequency, data volume and storage space occupied by the personnel precise positioning system are analyzed, and the main features for system data generation and use are summarized, a hybrid data storage architecture based on Redis, MySQL and files to respectively store hot data, warm data and cold data is proposed, and the key design of Redis, MySQL, file storage, data encryption and data query method based on Web API data interaction service are described in detail. By using simulated data testing, it was verified that the storage solution has high data access efficiency, can meet the needs of data storage and business function data query.

Copyright of Journal of Xinjiang University (Natural Science Edition) is the property of Xinjiang University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Drive for Locomotives is the property of Electric Drive for Locomotives Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Construction Technology is the property of Railway Construction Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the increasing use of optical fiber communication technology in the Industrial Internet of Things, cryptographic algorithms play a crucial role in ensuring the security of data transmission in embedded device environments.The SM4 packet cipher algorithm, developed independently in our country, is widely applied to wireless LAN and Internet of Things data encryption.However, the software-based encryption and decryption processes are relatively slow, which hampers their application in scenarios requiring high real-time performance, especially for embedded devices.To address this issue, a high-performance and secure optical fiber communication system was designed based on the FPGA platform and the SM4 algorithm.The FPGA was used to implement the MAC layer interface for SM4 algorithm encryption and decryption, as well as data transmission.Besides, an optimization scheme for the hardware implementation architecture of the SM4 algorithm was proposed.The critical path was shortened by employing a pipeline method, thereby improving the system clock frequency.Additionally, parallel processing of S-box transformation was accelerated to enable efficient data replacement.To reduce data reading delays, a dual-cache processing method was combined to facilitate easier processing of cache data and significantly reduce packet loss rates.This scheme greatly enhanced system data throughput.Experimental results demonstrate that compared to similar designs, the throughput of the SM4 algorithm encryption and decryption module in this scheme reaches up to 25.6 Gbit/s, with minimal differences in resource consumption.Due to limitations imposed by the 10-gigabit SFP+ optical module, the throughput of the entire optical fiber communication system reaches 9.4 Gbit/s.For 128-bit data, the average encryption speed is 0.47 μs/bit and the average decryption speed is 0.28 μs/bit, which can be applied to a variety of secure communication scenarios in the internet of things.

Copyright of Chinese Journal of Network & Information Security is the property of Beijing Xintong Media Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the adoption of a novel system architecture characterized by “physical distribution and logical unity” in new-type power systems， the support system for power grid scheduling is reconstructed. Under the new architecture， the human-machine cloud terminal （hereinafter referred to as “cloud terminal”） can realize local and remote undifferentiated browsing. However， the cloud terminal is also faced with new security challenges. First， the new architecture and the human-machine access process are analyzed， and the security problems are pointed out. Then， a unified security authentication method is proposed based on hardware fingerprint to authenticate human-machine cloud terminal is proposed. By use of digital certificates for power scheduling and biometric identification technology， multi-factor user identity authentication is performed. Startup authentication and service invocation verification are carried out， and encrypted transmission of service communication data is made possible to ensure service startup and access security. The service communication data is encrypted and transmitted to ensure the security of service startup and access. Finally， the performance of service authentication and encryption is tested， and the authentication and encryption strategies for different service request sizes are proposed. The test results show that the whole link security of human-machine access is guaranteed through the authentication of the cloud terminal， user identity， service， and communication data encryption.

In view of the security risks faced by RAM(Random Access Memory) and Flash memory of embedded on-chip systems, this study outlines physical attacks against memory of traditional SoC(System on Chip) chips, and presents a memory controller that supports encryption algorithms. Using the lightweight block cipher algorithm LBlock-s, the cryptographic security analysis shows that the algorithm has a good resistance to differential cryptanalysis. Compared with traditional block cipher algorithms such as AES(Advanced Encryption Standard), the proposed method reduces hardware resource consumption while guaranteeing security and is suitable for all kinds of resource-constrained secure SoC chips. To improve the data throughput, the hardware structure of the algorithm is expanded so that the standard 32 rounds of encryption or decryption take 1 clock cycle. This scheme guarantees that sensitive data cannot be parsed even if acquired by the attacker without consuming more hardware resources and encrypting delay, and effectively avoids physical attack on the security chip. [ABSTRACT FROM AUTHOR]

SM4 national security algorithm has been widely used in data encryption and decryption, However, with the explosive growth of the data volume of the Internet, there are problems such as the slow speed and high CPU utilization of the SM4 algorithm running in pure software mode, while the field programmable gate array or dedicated integrated circuit based on Verilog/VHDL has problems such as poor flexibility and difficulty in upgrading and maintenance. In order to solve the above problems, a design scheme of heterogeneous reconfigurable computing system based on SM4algorithm is proposed. Using high-level synthesis and heterogeneous reconfigurable technology, the customized computing architecture of SM4 algorithm’s electronic cipher book mode and counter mode is designed by optimizing the allocation and transmission of data memory, optimizing the loop, vectorizing the kernel and adding computing units, and the system is deployed on the FPGA heterogeneous platform. The experimental results show that the customized computing architecture of SM4-ECB and SM4-CTR, two mainstream operating modes, on the Intel Stratix 10 GX2800,has a throughput of 109.48Gbps and 63.73Gbps respectively, which is 232.63 times and 141.62 times the throughput of the corresponding mode on the Intel Xeon E5-2650 V2 CPU. The performance of the whole heterogeneous reconfigurable computing system composed of this core module, including data input, encryption and decryption, and output, has also reached 4.90 times and 3.56 times of that of pure software mode. This paper not only realizes customized acceleration for specific modes, but also flexibly supports different computing modes through hardware reconfiguration, taking into account the flexibility and efficiency of the system. [ABSTRACT FROM AUTHOR]

In view of the security problem of embedded device firmware update, this study proposes a multi-check firmware security update scheme based on hash, symmetric and asymmetric encryption algorithms. In this study, the master key pairs, temporary key pairs, shared key and hash chain are designed to protect firmware update from identity authentication, data encryption, integrity check and other aspects, which can effectively prevent illegal users, firmware tampering, firmware data leakage, replay attack, firmware rollback and other attacks. In this study, the concrete implementation of the security update scheme is carried out. The experiment results show that compared with the ISP(In System Programming) and IAP(In Application Pragramming) technologies without any security protection, the scheme achieves the security protection of the whole process of firmware update at the time cost of about 7% and 11%, it provides a safe and reliable update method for embedded device firmware update. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Agricultural product supply chain and blockchain are closely integrated with the continuous acceleration of agricultural modernization. The clustered supply chain has gradually developed from a single supply chain in recent years. There is heat competition among peer enterprises in the clustered agricultural product supply chain blockchain. Among them, the data on the blockchain is publicly available to all participants. The private data on the chain has been adopted as an encrypted storage model, in order to protect users' privacy. The existing single-department supervision scheme is unsuitable for the complex cluster agricultural supply chain. The multi-sector supervision can be expected to serve as a promising way in the current reality. However, multi-department supervision is still challenging to ensure the sharing of encrypted data on the chain without redundant information for irrelevant departments. It is a high demand to improve supervision efficiency and credibility. Fortunately, the ciphertext-policy attribute-based encryption (CP-ABE) can be a one-to-numerous encryption, essentially a public key encryption system. The CP-ABE can realize the sharing of data for the users with specified attributes suitable for the application environment of multi-department supervision of the blockchain in the clustered agricultural supply chain. In this research, a multi-department supervision scheme was proposed in the verifiable blockchain ciphertext policy for the cluster agricultural supply chains using CP-ABE. A chain of custody was set up outside the business chain, including the supervisors from various departments to facilitate the management of supervisors. The chain of custody managed data on the business chain through “cross-chain governance.” Different supervision strategies were set for the data on the chain, according to the data type. The administrator of the supervision department was set as the department's supervisor to supervise the specific data of the specific chain. According to the supervision strategy on the chain, the enterprise users encrypted the data using CP-ABE to realize the disclosure of data for privacy. A CP-ABE-based access tree verification scheme was designed to combine the smart contracts and supervision strategies, and then to verify the CP-ABE access tree before the data was uploaded to the chain, in order to ensure that the data was available to the designated supervisor. The direct use of CP-ABE was inefficient for data encryption. Therefore, hybrid encryption was used to encrypt and share the data. The specific implementation was to encrypt the original data with symmetric encryption and then use the CP-ABE to encrypt the symmetric encryption key. A supervision prototype system was constructed under the blockchain ciphertext of the clustered agricultural supply chain using Hyperledger Fabric. The system was tested in two aspects of function and performance. The functional test showed that the system fully met the needs of essential multi-department supervision. The performance test showed that each time the number of supervisors in the supervision strategy increased by 10, while the average on-chain time was extended by about 500 ms, and the average throughput was 438 (number of transactions/s, transactions/s). When the number of supervisors for a single data type of a single enterprise was within a reasonable range, the clustered system was adept to the multi-department supervision under the condition of the primary clustered agricultural supply chain blockchain ciphertext-application requirements. Security analysis indicated the high-security system. As such, this scheme can be expected suitable for the multi-departmental, specialized, and fine-grained supervision of data on the blockchain under data encryption. The pressure of regulators can be inspired by the development of blockchain supervision of cluster agricultural supply chains. [ABSTRACT FROM AUTHOR]

Copyright of Railway Signalling & Communication Engineering is the property of Railway Signalling & Communication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In the modern medical field of pathological diagnosis and surgical practice, it is necessary to perform three-dimensional reconstruction of CT (computed tomography) to realize three-dimensional visualization of two-dimensional images to improve the accuracy of diagnosis and operation. To address the current problems of time-consuming and poor accuracy of 3 D reconstruction, this paper proposed an improved MC (marching cubes) algorithm, which used an enclosing box segmentation algorithm to extract voxels containing equivalent surfaces, effectively improving the reconstruction efficiency, calculated the intersection of equivalent surfaces and voxels by using trilinear interpolation, thus improving the reconstruction accuracy. In order to ensure the security of medical information in cloud storage and network transmission, this paper proposed a three-dimensional model encryption scheme based on fractional Lorenz chaos, which realized the chaotic encryption of reconstruction data in the frequency domain. The experimental results show that the improved MC algorithm has good reconstruction efficiency and reconstruction accuracy, and the proposed encryption scheme can effectively protect the reconstructed 3 D data and resist exhaustive attacks, differential attacks and statistical attacks. [ABSTRACT FROM AUTHOR]

Copyright of Cyber Security & Data Governance is the property of Editorial Office of Information Technology & Network Security and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objectives: Security of vector spatial data is of importance in the community of geographic information sciences. It is necessary to encrypt the vector spatial data based on the consideration of data security. The existing method is to encrypt the entire data file, which affects the view of attribute data and destroys vector spatial data structure. Methods: A coordinate encryption method which does not change the structure of vector spatial data file is proposed, which not only protects the security of data, but also has no impact on the normal use of data. Firstly, vector spatial data are encrypted in Haar transform domain by the secret key. The secret key used to encrypt the coordinate data is generated combined Hash key with Gaussian random number. The average coefficient and the differential coefficient are obtained from Haar transformation of the vertex sequence of vector spatial data and are encrypted by the secret key. After that, the encrypted coordinates are obtained by Haar inverse transformation of data. Finally, the Gaussian random number is utilized to scramble the vertex sequence in order to get the encrypted disordered vector spatial data. Results: The experimental results show that: (1)The structure and attribute data of the vector spatial data file are completely unchanged after encryption, only the coordinates are encrypted, and efficiency is improved. (2) The algorithm can effectively decrypt and restore the original vector spatial data, with high security. Conclusions: The proposed method can not change the structure of vector spatial data, and the efficiency of encryption is improved. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Refrigeration Technology is the property of Shanghai Society of Refrigeration and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Telecommunication Engineering is the property of Telecommunication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The increase of in-vehicle electronic equipment makes the in-vehicle network face more and more threats. The lack of authentication of the Electronic Control Unit in the in-vehicle network and the lack of encryption of the communication data of the Controller Area Network make the in-vehicle network vulnerable to replay, ECU injection, man-in-the-middle forged messages, eavesdropping, etc, Witch make serious consequences. Aiming at the current vehicle network threats, a vehicle network security communication model based on SecOC is proposed. This model uses the SM4 cryptographic algorithm and the improved key management based on Bkake2 s to realize the authentication of the vehicle ECU and the encryption and authentication of the vehicle network message. Finally, after analysis and testing, the model can protect the invehicle network security and be more efficient. [ABSTRACT FROM AUTHOR]

With the development of big data and the increase of encryption scenarios, it 's difficult to meet the requirements of encryption performance with only software-run encryption methods, and FPGA/ ASIC encryption systems implemented using Verilog/VHDL methods have poor flexibility and difficult maintenance and upgrades problem. In response to the above problems, this paper designed and implemented an AES algorithm encryption system based on heterogeneous reconfigurable computing, including three mainstream modes of AES algorithm ECB, CBC, CTR, each mode realized 128 bit, 192 bit, 256 bit encryption of three key sizes. This paper realized the hardware acceleration of the module based on FPGA, and realized the dynamic switching of different modes and different bit width encryption modules based on the hardware reconfigurable mechanism. By implementing and verifying the system on Intel Stratix 10, the experimental results show that the throughput rates of AES-ECB, AES-CTR and AES-CBC in the system are 116.43 Gbps,60. 34 Gbps, and 4. 32 Gbps, respectively. The ECB mode compared with Intel Xeon E5-2650 V2 CPU and NVIDIA GeForce GTX 1080 GPU achieves 23.18 times and 1.43 times acceleration ratios respectively. Compared with the method just calling the CPU,the overall system has a computational acceleration ratio of 4.72. [ABSTRACT FROM AUTHOR]

With the advent of the 5G era and the increasing public awareness of the Internet, the public has paid more and more attention to the protection of personal privacy. Due to malicious communication in the process of data encryption, to ensure data security and safeguard social and national interests, the research work on encrypted traffic identification is particularly important. Therefore, this paper describes the TLS traffic in detail and analyzes the improved technology of early identification method, including common traffic detection technology, DPI detection technology, proxy technology, and certificate detection technology. It also introduces machine learning models for selecting different TLS encrypted traffic characteristics, as well as many recent research results of deep learning models without feature selection. The deficiencies of the related research work are summarized, and the future research work and development trend of the technology have been prospected. [ABSTRACT FROM AUTHOR]

Copyright of Journal on Communication / Tongxin Xuebao is the property of Journal on Communications Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To solve both problems of data leakage and sharing difficulties in the method of centralized storage of traditional electronic forest fire archival data, this paper puts forward a sharing scheme for forest fire archival data based on block chain technology. Combining block chain technology and interplanetary file system（IPFS）, the scheme establishes a block chain network based on the Hyperledger Fabric platform, uploads complete forest fire archival data to the network of IPFS after symmetrical encryption and generated data summary information to the block chain network after asymmetric encryption, and adopts proxy re-encryption algorithm to encrypt the generated information in order to ensure data security in the process of data communication. The results of encryption tests show that the symmetric encryption algorithm can encrypt 20 M fire data 59.3 ms faster than do the asymmetric encryption algorithm; according to the data of data storage tests, it can be found that it takes 4.117 5 ms to upload 20 M fire data to the network of IPFS. The results of system performance tests show that the sharing scheme for forest fire archival data based on block chain technology has a query ceiling of 300 TPS for such data. On the premise of ensuring the efficiency of system, the scheme can realize the immutable storage of forest fire data and the purpose to expand the sharing scope of such data through the increase of nodes in the network. [ABSTRACT FROM AUTHOR]

Copyright of Railway Signalling & Communication Engineering is the property of Railway Signalling & Communication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Frontiers of Computer Science & Technology is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Information & Control is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the growth of the breadth and depth of LoRa network applications, the demand for information security is gradually increasing, so ensuring the security of data transmission network is a necessary condition for the development and application of LoRa network. The traditional LoRa net work has its own encryption mechanism in the process of data transmission, which uses AES-128 encryption algorithm to encrypt data messages. However, in the process of encryption and decryption, the two keys are relatively symmetric, so that their parameters are roughly the same. When any one of the keys is leaked, it is easy to calculate the other key. In view of the existing security problems, a hybrid data encryption scheme is proposed： RSA asymmetric encryption algorithm is introduced into LoRa network, and the key used in the process of encryption and decryption of data by AES encryption algorithm is encrypted by taking advantage of RSA encryption algorithm's high security, so as to reduce the security risks of network data transmission and improve the security. Then, on this basis, AES and RSA encryption algorithm are optimized to ensure the efficiency of data transmission. Finally, the design is tested. The test results show that the proposed method can not only ensure the efficiency of data transmission, but also enhance the security of key against stealing, thus greatly improving the security of data transmission in LoRa network. [ABSTRACT FROM AUTHOR]

Copyright of Railway Standard Design is the property of Railway Standard Design Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to effectively solve the problems of multimedia data security and copyright protection in the process of transmission and storage, this paper proposed a commutative encryption and watermarking algorithm based on Zu Chongzhi(ZUC) stream cipher algorithm and DWT-SVD. Based on the invariance of the singular value, the algorithm embedded the watermark into the singular value, and used the ZUC algorithm to permutate and encrypt the set of the singular value matrix and the set of the singular matrix respectively. The sequence of embedding operation and encryption operation did not affect the generation of the watermarked ciphertext, meanwhile, both watermarked ciphertext and decrypted plaintext can extract watermark completely. The experimental results show that the watermark has good invisibility, and the algorithm has high security and a certain robustness. [ABSTRACT FROM AUTHOR]

Commutative encryption and watermarking ( CEW) is a combination of cryptographic and digital watermarking technology, which is used for multimedia information security and copyright protection. In order to ensure the security of carrier data, this paper proposed an exchange encryption watermarking algorithm based on ZUC. The algorithm used the ZUC sequence cipher to generate the key and used modular operation to encrypt the carrier information. The sequence of watermark embedding operation and data encryption operation did not affect the generation of watermark ciphertext data. When extracting the watermark, the algorithm could realize the exchange of password operation and watermark operation. The experimental results show that the watermark extraction in ciphertext domain is consistent with that in plaintext domain, the image containing watermark is of high quality, the efficiency of encryption and decryption, watermark embedding and extraction are higher, and the algorithm has a certain robustness. [ABSTRACT FROM AUTHOR]

The existing data encryption of coal mine safety monitoring system is mostly in the form of database encrypted storage or file encryption, there are some problems such as the high performance overhead and unable to track data change records, which reduce the stability and safety of the safety monitoring system. According to the data tampering proofing requirements of coal mine safety monitoring system, a method is proposed that can identify, track and record tampering behaviors based on the combination of variable data capture mechanism and message digest encryption. This method achieves a good balance between safety, performance and storage, and has good compatibility.

Copyright of Journal on Communication / Tongxin Xuebao is the property of Journal on Communications Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the weakness of existing medial image encryption algorithm based on chaotic system in considering the image' s texture feature, this paper proposed a medical image encryption and decryption method based on chaotic mapping and adaptive partitioning. Firstly, it used the 2D Sine Logistic chaotic system to generate two secure sequences with good chaotic characteristics . Then, it divided the original medical image into fixed size image blocks, and calculated their maximum pixel difference and variance . According to the given threshold, it divided these image blocks into texture smooth blocks and texture complex blocks. Finally, it used the first chaotic sequence with ciphertext feedback mechanism to encrypt the smooth blocks, and encrypt the complex blocks by using the second chaotic sequence with plaintext feedback mechanism. Therefore, it obtained the encrypted image. Because the presented algorithm efficiently considered the texture characteristics of image blocks and optimized the algorithm of chaotic encryption, it improved the encryption and decryption efficiency of medical images. Experimental simulation results show that the presented algorithm has high security and encryption efficiency. Compared with the existent method, it reduces the encryption and decryption time by about 0. 5 times . The presented algorithm is suitable for real-time medical images encryption and decryption with big data size. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Image & Graphics is the property of Editorial Office of Journal of Image & Graphics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the shortage of medical images encryption algorithm in efficiency and security, this paper proposed a novel medical image encryption algorithm in frequent domain based on 2D sine Logistic chaotic mapping. Firstly, the proposed algorithm used the integer wavelet transform of LeGall5/3 to transform medical image from frequent domain to spatial domain. In this way, the high correlation among pixels has disappeared. Then, the proposed algorithm utilized 2D sine logistic chaotic mapping to generate the chaotic sequences. In order to improve the encryption efficiency, this algorithm chose the low frequency coefficients of three-level decomposed to encrypt with chaotic diffusion and scrambling mechanism. In the same time, this algorithm also selected the medium-high frequency coefficients of two-level decomposed to encrypt by chaotic diffusion mechanism for solving the problem of obvious outline in encrypted image. Finally, this algorithm transformed the encrypted wavelet coefficients by the inverse integer wavelet transform and obtained the encrypted image. Experimental simulation results demonstrate that the proposed algorithm is able to protect medical images with low time complexity and a high security level. Compared with the existing spatial method, it reduces the encryption time by about 0.025 times. In addition, the proposed algorithm has better image imperceptibility as well as an excellent encryption efficiency compared to the existing frequent method. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Image & Graphics is the property of Editorial Office of Journal of Image & Graphics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to solve the shortcomings of the traditional serial encryption method in single machine mode, such as the low density of data security, the difficulty in encrypting-efficiency to meet the requirement of increasing information data encryption and the excessive amount of memory in the running process, and so on. This paper designed a scheme of chaotic encryption algorithm based on Hadoop platform. The scheme used MapReduce parallel framework, chaotic encryption pseudorandom number and the principle of initial value sensitivity. And it proposed parallel chaotic encryption scheme for MapReduce framework and chaotic encryption optimization. It used the length of the plaintext as the initial value, and used Chen, Lorenz, Rossler chaotic system to generate secret key. At the same time, the paper proposed an idea of dividing plaintext data into blocks according to 1 MB. According to the offset, it judged each block to gene rate three key sequences of Chenn Lorenzi R0ssler whose length is 1 MB, to improve the security of data density, and reduce the amount of running memory and other purposes. This design framework used Chen sequence for plaintext messing operation, used Lorenz sequence for XOR diffusion ope ration and used Rössler sequence for modular auxiliary diffusion operation. Experiments prove that, for MapReduce, the optimization algorithm of using parallel framework and chaotic system can effectively reduce the amount of memory and improve the encryption speed, and the encryption ope ration associated with plaintext achieves the purpose of effectively defending against the attack of selected plaintext. [ABSTRACT FROM AUTHOR]

In the traditional attribute-based encryption scheme, there are problems that the attributes contained in the access policy may leak sensitive information of the user and the malicious user leaks the private key to gain illegal profits without being blamed. At the same time, with the increasing of the number of attributes the length of the private key, ciphertext, and the decryption operation will increase and it bring greater communication overhead and computational overhead. To solve these problems, this paper proposed an attribute-based encryption scheme that can track keys and hide the access structure. The scheme improved the security of the encryption algorithm without affecting the efficiency of encryption and decryption. The scheme adopted a two -factor authentication mechanism to achieve more secure and efficient access control, and it used a secure signature mechanism for supporting traceable keys to track malicious users. Finally, the theoretical analysis show that this scheme proved to be safe under the standard model based on the DBDH hypothesis. [ABSTRACT FROM AUTHOR]

For data encryption storage requirement of safety monitoring and control system in Technology schemes of upgrading of coal mine safety monitoring and control system(exposure draft), database encryption technology was researched, and performances of four data encryption algorithms including DES, RSA, homomorphism and binary serialization were tested and compared. A data encryption scheme suitable for coal mine safety monitoring and control system was proposed, which used different data encryption algorithm for different field type. The scheme realizes safe and quick data encryption storage for coal mine safety monitoring and control system.

A ＂big clouds audited by a small cloud＂ scheme was proposed,by introducing an independent trusted third party (TTP) dealing with run-time data collection,verification,audit and evaluation remotely,in a continuous and data-driven model,compared with traditionally certification based audit.The TTP mainly adopts data flow visualization,data monitoring and encryption to protect the rights of users.It provides the basis for users to choose a trusted cloud platform and for cloud platform to prove own trusted credentials.In-depth study,the following key technologies were broken through:1) the introduction of an independent trusted third party as an intermediate layer between cloud platform and users as well as administrators; 2) continuous,real-time remote data collection and data analysis; 3) strong non-intrusive evidence gathering.

The problem of leaking through express sheet brings security risks to individuals, but also restricts the rapid development of express enterprises. This paper studied the privacy protection of express sheet. By combining the identity based encryption system (BF-IBE), the idea of authority design and the two-dimensional code technology, this paper designed a block encryption scheme. The scheme used a new private key distribution protocol (IC protocol) to solve the key management problem. This paper applied the block encryption scheme to the domain of express privacy protection, and designed a new privacy express sheet and express business process. The results show that the IC protocol uses in the block encryption scheme needs no inverse operation, and the bilinear pairings can be effectively reduced and the key management can be carried out easily. The encryption and decryption efficiency of the block encryption scheme is similar to that of BF-IBE. Its security is based on the discrete logarithm problem on elliptic curves. It can be applied to express field, which can effectively protect the user’s privacy. It is also suitable for other areas with block encryption requirements. [ABSTRACT FROM AUTHOR]

The design of efficient and secure lattice-based post quantum key exchange protocols has certain practical and theoretical significance. This paper proposed a scheme used straight-forward transformation LWE encryption mechanism and a ciphertext compression technology. This was a passively secure and practical key exchange protocol. Frodo was a key exchange scheme based on LWE problem proposed by Bos et al. which used the error reconciliation mechanism proposed by Peikert. The main advantage of the scheme over Frodo was simplicity. Compared with Frodo. the communications traffic merely increased by only 1.09%. reduced the complexity of the scheme effectively. It proved scheme to be passive security. which could resist quantum computer attacks. Compared with existing key exchange protocol based on learning with error, this protocol is very competitive. [ABSTRACT FROM AUTHOR]

A searchable encryption scheme that specifically supports genetic data was proposed to protect users from privacy risks. The existing searchable encryption schemes only support keywords search， they cannot be applied to genetic data without keywords. So， a security index using cryptographic primitives such as suffix trees and pseudo-random functions was constructed to implement arbitrary substring searches for ciphertext genomic data. The safety proof indicated that the method satisfies the dynamic adaptive security， and the efficiency is evaluated by both theoretical analysis and real data. This scheme can perform efficient and safe arbitrary substring search on genomic data，protect data integrity and privacy and has broad application prospects in the environment of personalized medical popularization. [ABSTRACT FROM AUTHOR]

In order to achieve greater safety in RSA encryption algorithm in the data encryption process, this paper made some improvements based on in-depth analysis on the traditional RSA algorithm. It put forward a more secure method with changing traditional double primes into four primes in the traditional RSA algorithm and eliminating the requirement for transferring the product n of two random primes in public key on the basis of parameter substitution. Instead, this paper replaced the original parameter n to a new introduced parameter x. In order to boost the efficiency in the introduced algorithm, this paper used the CRT(Chinese remainder theorem) to expedite the exponentiation of large numbers. The results demonstrate the feasibility of the improved algorithm, and it provides a safer path for messages transmission through public key encryption. At the same time, this paper carried out a comparative analysis of encryption and decryption time among the improved algorithm and the traditional double primes and four primes RSA algorithms. The results show that the improved algorithm to a certain degree enhanced the encryption and decryption efficiency between the message sender and receiver. [ABSTRACT FROM AUTHOR]

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This paper proposes a searchable encryption model for graph data to address the problem that most of the current searchable encryption schemes cannot deal with complex data structures. The algorithms and security models of the scheme are described. Taking the encryption index of matrix structure into account， the detailed description of the searchable encryption scheme for graph data that supports adjacency queries is presented. The scheme utilizes pseudo-random functions and pseudo-random permutations to protect the privacy of the graph data and the encrypted index. Real models and ideal models test the security of the scheme. Compared with traditional searchable encryption schemes， the proposed scheme has more flexible searching ability and higher efficiency， which promotes broader application under big data environment. [ABSTRACT FROM AUTHOR]