Cryptanalysis of some self-synchronous chaotic stream ciphers and their improved schemes

Baoju Chen, Simin Yu, David Day-Uei Li, Jinhu Lü

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
14 Downloads (Pure)


In this paper, a cryptanalysis method that combines a chosen-ciphertext attack with a divide-and-conquer attack by traversing multiple non-zero component initial conditions (DCA- TMNCIC) is proposed. The method is used for security analysis of n-D (n=3,4,5,6,7,8) self- synchronous chaotic stream ciphers that employ a product of two chaotic variables and three chaotic variables (n-D SCSC-2 and n-D SCSC-3), taking 3-D SCSC-2 as a typical example for cryptanalysis. For resisting the combinational effect of the chosen-ciphertext attack and DCA- TMNCIC, several improved chaotic cipher schemes are designed, including 3-D SCSC based on a nonlinear nominal system (3-D SCSC-NNS) and n-D SCSC based on sinusoidal modulation (n-D SCSC-SM (n=3,4,5,6,7,8)). Theoretical security analysis validates the improved schemes.
Original languageEnglish
Article number2150142
Number of pages26
JournalInternational Journal of Bifurcation and Chaos
Issue number8
Publication statusPublished - 30 Jun 2021


  • chosen-ciphertext attack
  • chaotic stream cipher
  • cryptanalysis
  • n -D SCSC-2
  • 3-D SCSC-NNS
  • n -D SCSC-SM


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