Cryptanalyzing - An encryption scheme based on blind source separation

Shujun Li, Chengqing Li, Kwok Tung Lo, Guanrong Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)1055-1063
Number of pages9
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number4
Publication statusPublished - 1 May 2008


  • Blind source separation (BSS)
  • Chosen-ciphertext attack
  • Chosen-plaintext attack
  • Cryptanalysis
  • Differential attack
  • Divide-and-conquer (DAC) attack
  • Image encryption
  • Known-plaintext attack
  • Speech encryption

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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