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A chaotic orbit generated by a nonlinear system is irregular, aperiodic, unpredictable and has sensitive dependence on initial conditions. However, the chaotic trajectory is still not well enough to be a crypto system in digital secure communication. Therefore, we propose a Modified Logistic Map (MLM) and give a theoretical proof to show that the MLM is a chaotic map according to Devaney's definition. Based on the MLMs, we establish a Modified Logistic Hyper-Chaotic System (MLHCS) and apply MLHCS to develop a symmetric cryptography algorithm, Asymptotic Synchronization of Modified Logistic Hyper-Chaotic System (ASMLHCS). [ABSTRACT FROM AUTHOR]

Many organizations have great deal of confidential information which is stored on computers. Such information is desired to be kept securely yet giving a convenience of accessibility from any part of the world. For data security, one can use an encrypting file system such as eCryptfs [1], dmCrypt [2], File Vault [3]. However these encrypting file systems do not address the problem of accessing files over network from public computers. In this case the public host, the actual FileServer host and the network between them are vulnerable to many attacks. This paper discusses the major problems and proposes a solution for the same using TransCrypt [4] encrypting file system. It also describes how the proposed solution can be implemented on a Linux-based environment. [ABSTRACT FROM AUTHOR]

The rapid development of multimedia and internet allows for wide distribution of digital media data. It becomes much easier to edit, modify and duplicate digital information. In additional, digital document is also easy to copy and distribute, therefore it may face many threats. It became necessary to find an appropriate protection due to the significance, accuracy and sensitivity of the information. Nowadays, protection system can be classified into more specific as hiding information and encryption information or a combination between them. The strength of the combination between hiding and encryption science is due to the non-existence of standard algorithms to be used in (hiding and encryption) secret messages. Also there is randomness in hiding methods such as combining several media (covers) with different methods to pass a secret message. Furthermore, there is no formal method to be followed to discover a hidden data. In this paper, a new information hiding system is presented. The aim of the proposed system is to hide information (data file) in an execution file (EXE).The new proposed system is able to embed an information in an execution file and also able to retract the hidden file from the execution file. Meanwhile, since the cover file might be used to identify hiding information, the proposed system considers overcoming this dilemma by using the execution file as a cover file. [ABSTRACT FROM AUTHOR]

A Sparse Distributed Memory (SDM) is a kind of associative memory suitable to work with high-dimensional vectors of random data. This memory model is attractive for Robotics and Artificial Intelligence, for it is able to mimic many characteristics of the human long-term memory. However, sensorial data is not always random: most of the times it is based on the Natural Binary Code (NBC) and tends to cluster around some specific points. This means that the SDM performs poorer than expected. As part of an ongoing project, in which we intend to navigate a robot using a sparse distributed memory to store sequences of sensorial information, we tested different methods of encoding the data. Some methods perform better than others, though some may fade particular characteristics present in the original SDM model. [ABSTRACT FROM AUTHOR]

Digital watermarking is a technique for protecting intellectual property of digital information. However, when a work is created by multiple authors, digital watermarking may suffer some problems. When each author embeds his/her watermark, it is highly probable that the latter watermark will compromise the former one. Additionally, it is reasonable that no author can prove the ownership alone since all authors own the work jointly. In this paper, we will propose a copyright protection scheme, which is suitable for co-authored works and without drawbacks of digital watermarking. Our scheme integrates discrete cosine transform and visual cryptography to meet the requirement of robustness and security. The experimental results show that our scheme can resist some common attacks successfully. [ABSTRACT FROM AUTHOR]

In this paper, we attempt to develop image watermarking algorithms which are portable to a variety of applications such as copyright protection, fingerprinting and identification. Therefore, we require that the watermark be binary and be not only detectable but also extractable. The embedding technique is based on the parent-child structure of the multiwavelet transform called "triple tree" and this technique does not require the original image in the watermark extraction. The experimental results show that the watermark. [ABSTRACT FROM AUTHOR]

The paper deals with the design and realization of a secure multicarrier modem on FPGA. The crypto-modem principle is adopted. An encryption block is integrated in the modem transmitter and a decryption block is integrated in the modem receiver. Different Encryption/Decryption IPs (Intellectual Properties) implementing DES (Data Encryption Standard), 3DES (Triple DES) and AES (Advanced Encryption Standard) algorithms are developed and/or adapted in order to estimate the feasibility as well as the time and area efficiency of the crypto-modem. The design language used is VHDL and the crypto-modem system is validated in ISE environment, using Xilinx development board with XC4VSX3S circuit from VIRTEX-4 family. [ABSTRACT FROM AUTHOR]