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As a fundamental theorem in number theory, the Chinese Reminder Theorem (CRT) is widely used to construct cryptographic primitives. This paper investigates the security of a class of image encryption schemes based on CRT, referred to as CECRT. Making use of some properties of CRT, the equivalent secret key of CECRT can be recovered efficiently. The required number of pairs of chosen plaintext and...
This paper re-evaluates the security of a secure Lempel-Ziv-Welch (LZW) algorithm proposed at ICME'2008. A chosen-plaintext attack is proposed to break all ciphertext indices corresponding to single-symbol dictionary entries. For short plaintexts the chosen-plaintext attack works well because string-symbol strings appear very frequently. The number of required chosen plaintexts is at the order of...
This paper studies the joint security and performance enhancement of secure arithmetic coding (AC) for digital rights management applications. The proposed cryptosystem incorporates the interval splitting AC with a simple bit-wise XOR operation step. Security analysis results show that the proposed scheme provides satisfactory level of security against the cipher-only attack, the chosen-plaintext...
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