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By combining techniques of watermarking and fingerprinting , a sound buyer-seller watermarking protocol can address the issue of copyright protection in e-commerce. In this paper, we analyze the security of two recent anonymous buyer-seller watermarking protocols proposed by Ju et. al and Choi et. al respectively, and prove that they do not provide the(More)
In this paper, we present a mini version of Rijndael, the symmetric-key block cipher selected as the Advanced Encryption Standard (AES) recently. Mini-AES has all the parameters significantly reduced while at the same time preserving its original structure. It is meant to be a purely educational cipher and is not considered secure for actual applications.(More)