Welcome to the resource topic for 2007/397
Title:
On the security defects of an image encryption scheme
Authors: Chengqing Li, Shujun Li, Muhammad Asim, Juana Nunez, Gonzalo Alvarez, Guanrong Chen
Abstract:This paper studies the security of a recently-proposed chaos-based image encryption scheme, and points out the following problems: 1) there exist a number of invalid keys and weak keys, and some keys are partially equivalent for encryption/decryption; 2) given one chosen plain-image, a subkey K_{10} can be guessed with a smaller computational complexity than that of the simple brute-force attack; 3) given at most 128 chosen plain-images, a chosen-plaintext attack can possibly break the following part of the secret key: \{K_i\bmod 128\}_{i=4}^{10}, which works very well when K_{10} is not too large; 4) when K_{10} is relatively small, a known-plaintext attack can be carried out with only one known plain-image to recover some visual information of any other plain-images encrypted by the same key.
ePrint: https://eprint.iacr.org/2007/397
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