Cryptanalysis of two chaotic encryption schemes based on circular bit shift and XOR operations

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

68 Citations (Scopus)


Recently two encryption schemes were proposed by combining circular bit shift and XOR operations, under the control of a pseudorandom bit sequence (PRBS) generated from a chaotic system. This Letter studies the security of these two encryption schemes and reports the following findings: (1) there exist some security defects in both schemes; (2) the underlying chaotic PRBS can be reconstructed as an equivalent key by using only two chosen plaintexts; (3) most elements in the underlying chaotic PRBS can be obtained by a differential known-plaintext attack using only two known plaintexts. Experimental results are given to demonstrate the feasibility of the proposed attack.
Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number1-2
Publication statusPublished - 10 Sep 2007


  • Chaos
  • Chosen-plaintext attack
  • Cryptanalysis
  • Delayed chaotic neural network
  • Differential cryptanalysis
  • Encryption
  • Known-plaintext attack

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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