State convergence in bit-based stream ciphers

Teo, Sui-Guan, Bartlett, Harry, Alhamdan, Ali, Simpson, Leonie, Wong, Kenneth Koon-Ho, & Dawson, Edward (2013) State convergence in bit-based stream ciphers. [Working Paper] (Submitted (not yet accepted for publication))


Well-designed initialisation and keystream generation processes for stream ciphers should ensure that each key-IV pair generates a distinct keystream. In this paper, we analyse some ciphers where this does not happen due to state convergence occurring either during initialisation, keystream generation or both. We show how state convergence occurs in each case and identify two mechanisms which can cause state convergence.

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ID Code: 57525
Item Type: Working Paper
Refereed: No
Keywords: Stream Ciphers, State convergence, Mickey, A5/1, Sfinks, Summation generator
Subjects: Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > DATA FORMAT (080400) > Data Encryption (080402)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > Institutes > Institute for Future Environments
Current > Schools > School of Mathematical Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 the authors
Deposited On: 22 Feb 2013 01:24
Last Modified: 22 Feb 2013 23:23

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