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A novel compression and encryption scheme using variable model arithmetic coding and coupled chaotic system, different from the traditional way which compresses the data first and then encrypts the compressed bit-stream later, can encrypt and compress the input plaintext synchronously. In this paper, an improved scheme using variable interval arithmetic coding and asymptotic deterministic randomness...
DRM (Digital Rights Management) is a basic tool to protect digital content from unauthorized using, which is regarded as one of the most important mechanisms in content industry. In a basic scenario of DRM application, there are a couple of roles are involved, named Content Provider (CP), Service Provider (SP) and consumer Device. CP makes the digital content and distributes to SP, who will then deliver...
When the E-cash file being destroyed for some unexpected error, we cannot expect waiting for the recovery of the file, but improve the design of E-cash system such that the bank can compute the amount of E-cash the user really lost. Recoverability and untraceability (anonymous) are two obviously conflicting properties. If we give up untraceability, we can compute the lost E-cash by computing the difference...
An algorithm for one-way hash function construction based on conservative chaotic system is proposed. The plaintext is divided into a group of message blocks by a fixed length and each message block is iterated some times through standard map. Both the iterations results of every round and the plaintext block determine the two initial values and the steps of iterations in next round. Some items of...
An Improved Baptista algorithm based on conservative chaotic system is proposed in this paper. During encryption, the initial value of the chaotic system is updated timely. The plaintext is divided into groups at the length of a character. In the standard map, when the integer part of y is equivalent to the value of character's ASCII code, iteration is selected as the cipher text. And before each...
This paper surveys the legal and regulatory environment surrounding copyright protection technologies, focusing on China in particular. The paper begins with a discussion of some of the interactions between law and technology in copyright protection, which has led to the creation of international treaties to protect the technologies that protect copyrights. A comparison of the various national responses...
A wide spectrum of e-commerce (B2B/B2C), banking, financial trading and other business applications require the exchange of data to be highly secure. The Secure Sockets Layer (SSL) protocol provides the essential ingredients of secure communications - privacy, integrity and authentication. Though it is well-understood that security always comes at the cost of performance, these costs depend on the...
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