Title :
Cryptanalyzing an Encryption Scheme Based on Blind Source Separation
Author :
Li, Shujun ; Li, Chengqing ; Lo, Kwok-Tung ; Chen, Guanrong
Author_Institution :
Lehrgebiet Informationstechnik, Fern Univ. in Hagen, Hagen
fDate :
5/1/2008 12:00:00 AM
Abstract :
Recently, there was a proposal of using the underdetermined blind source separation (BSS) principle to design image and speech encryption. In this paper, we report a cryptanalysis of this BSS-based encryption scheme and point out that it is not secure against known-/chosen-plaintext attack and chosen-ciphertext attack. In addition, we discuss some other security defects of the schemes: (1) it has a low sensitivity to part of the key and to the plaintext; (2) it is weak against a ciphertext-only differential attack; and (3) a divide-and-conquer (DAC) attack can be used to break part of the key. We finally analyze the role of BSS in this approach towards cryptographically secure ciphers.
Keywords :
blind source separation; cryptography; divide and conquer methods; image processing; speech processing; blind source separation; chosen-ciphertext attack; chosen-plaintext attack; cryptanalysis; divide-and-conquer attack; encryption scheme; image encryption; speech encryption; Blind source separation (BSS); blind source separation (BSS); chosen-ciphertext attack; chosen-plaintext attack; cryptanalysis; differential attack; divide-and-conquer (DAC) attack; divide-and-conquer (DAC)attack; image encryption; known-plaintext attack; speech encryption;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2008.916540
