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Today’s digital world is entirely managed on the internet digitally. So to confirm the Confidentiality, Integrity and Availability of users data in transit and at rest using a hybrid encryption in place of using a particular encryption algorithm. In this paper we are going to propose the hybrid approach which is a combination of multiple symmetric block ciphers and stream ciphers primarily AES-GCM, Chacha20 Poly-1305, Multi Fernet and Fernet to assure more security in an acceptable time period.

Today’s digital world is entirely managed on the internet digitally. So to confirm the Confidentiality, Integrity and Availability of users data in transit and at rest using a hybrid encryption in place of using a particular encryption algorithm. In this paper we are going to propose the hybrid approach which is a combination of multiple symmetric block ciphers and stream ciphers primarily AES-GCM, Chacha20 Poly-1305, Multi Fernet and Fernet to assure more security in an acceptable time period.

The scheme [1] is flawed because: (1) its circuit access structure is confusingly described; (2) the cloud server cannot complete the related computations; (3) some users can conspire to generate new decryption keys, without the help of the key generation authority., SCOPUS: ar.j, info:eu-repo/semantics/published

This thesis focuses on structural remodelling and security proof of cryptographic schemes. A message pre-processing, also known as asymmetric message padding, is an essential step in asymmetric encryption which is heavily used in secure banking applications. In this thesis, we propose new effective padding schemes and able to mitigate the various computation and memory overhead compared to previous works. We are also able to provide streaming capability which was missing in most of the previous works. Mathematical security proof of proposed schemes justifies their security.

У роботі розглянуті сучасні алгоритми шифрування та проблеми, які виникають при їх використанні; описано метод гібридного шифрування. Запропоновано метод багатошарового гібридного шифрування, який розроблено для безпечного обміну інформацією у мережі Інтернет, з використанням аси-метричного та n–кількості симетричних алгоритмів.

В работе рассмотрены современные алгоритмы шифрования и проблемы, возникающие при их использовании; описан метод гибридного шифрования. Предложен метод многослойного гибридного шифрования, который разработан для безопасного обмена информацией в сети Интернет, с использованием асимметричного и n–количества симметричных алгоритмов., Introduction. The paper deals with modern encryption algorithms and problems associated with their use. Hybrid encryption method was developed for secure communication over the Internet. Principal part. Symmetric algorithms, which used in method, are AES, Serpent and Twofish, asymmetric algorithm is RSA. For each layer new secure random key is generated and encrypted by RSA. This key is aligned and written in the beginning of the encrypted data. On decryption key is read from the beginning of encrypted data and decrypted by RSA secret key. Then symmetric key is used to decrypt data layer by layer. Conclusions. Use of multilayer hybrid encryption allows to transmit both keys and data by unsecure channel and ensure that data will be protected and at least one symmectric algorithm is not compromised., У роботі розглянуті сучасні алгоритми шифрування та проблеми, які виникають при їх використанні; описано метод гібридного шифрування. Запропоновано метод багатошарового гібридного шифрування, який розроблено для безпечного обміну інформацією у мережі Інтернет, з використанням аси-метричного та n–кількості симетричних алгоритмів.

In INFOCOM 2010, Pietro, Oligeri, Soriente, and Tsudik (POST) proposed an intrusion-resilient system with forward and backward secrecy in mobile Unattended Wireless Sensor Networks (UWSNs), where sensors move according to some mobility model (random jump model and random waypoint model). In the POST scheme, each sensor encrypts its ephemeral key K as a plaintext by using the sink’s public key, and sends this ciphertext and the encrypted sensed data by K. Although the POST scheme recommends the hybrid encryption, it does not follow the conventional hybrid encryption usage, i.e., the POST scheme is not necessarily secure. More concretely, K must be regarded as a plaintext of the underlying public key system, and therefore the POST scheme requires at least one more encryption procedure (i.e, encryptions for both K and the data) compared with the conventional hybrid encryption procedure. In this paper, we scrutinize the original POST intrusion-resilient system. We set deployed information as a seed used for generating a random number (which is applied for public key encryption). This procedure follows the conventional hybrid encryption usage, and random-numberleakage problem does not occur. In conclusion, we improve the POST scheme from the viewpoint of both security and efficiency without spoiling significant benefit points of the original one., identifier:https://dspace.jaist.ac.jp/dspace/handle/10119/10656

In INFOCOM 2010, Pietro, Oligeri, Soriente, and Tsudik (POST) proposed an intrusion-resilient system with forward and backward secrecy in mobile Unattended Wireless Sensor Networks (UWSNs), where sensors move according to some mobility model (random jump model and random waypoint model). In the POST scheme, each sensor encrypts its ephemeral key K as a plaintext by using the sink’s public key, and sends this ciphertext and the encrypted sensed data by K. Although the POST scheme recommends the hybrid encryption, it does not follow the conventional hybrid encryption usage, i.e., the POST scheme is not necessarily secure. More concretely, K must be regarded as a plaintext of the underlying public key system, and therefore the POST scheme requires at least one more encryption procedure (i.e, encryptions for both K and the data) compared with the conventional hybrid encryption procedure. In this paper, we scrutinize the original POST intrusion-resilient system. We set deployed information as a seed used for generating a random number (which is applied for public key encryption). This procedure follows the conventional hybrid encryption usage, and random-numberleakage problem does not occur. In conclusion, we improve the POST scheme from the viewpoint of both security and efficiency without spoiling significant benefit points of the original one.