On the security defects of an image encryption scheme
Image and Vision Computing 27(9): 1371-1381
Article 2009 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
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
mod
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.
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