On the security defects of an image encryption scheme.
Preprint 2007 English
Authors
CL
Chengqing Li
SL
Shujun Li
MA
Muhammad Asim
Abstract
1 min read
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 K10 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: fKi mod 128g 10=4 , which works very well when K10 is not too large; 4) when K10 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.
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