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Several sufficient conditions for quadratic bent functions represented by trace are given. These sufficient conditions correspond to two families of quadratic bent functions in polynomial forms. Furthermore, the first family of bent functions includes the function proposed by Udaya and some functions proposed by Hu and Feng.
Recently Cash, Kiltz and Shoup [5] proposed a new computational problem called twin Diffie-Hellman problem. This paper investigates properties of the trapdoor test introduced in [5]. Secondly this paper presents some new relations between the twin Diffie-Hellman problem and the Diffie-Hellman problem.
Proxy blind signature, which combines the properties of both proxy signature and blind signature, is useful in many applications. Based on ECLDP, Wang et al. recently proposed a proxy blind signature scheme. In this paper, we present a security analysis on Wang's scheme and prove it does not possess the strong nonrepudiation, strong unforgeability and unlink- ability properties by three efficient...
One of the threats to watermarking security is unauthorized removal. In this paper, a framework based on extended Trusted Computer Platform to solve this problem was presented. Using Trusted Computing Platform could enhance the security of watermarking detection. The TPM as a supervisor that control the watermark detection program and only the legal one can use the secret knowledge, that is, this...
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