2011 | OriginalPaper | Buchkapitel
State Convergence in the Initialisation of Stream Ciphers
verfasst von : Sui-Guan Teo, Ali Al-Hamdan, Harry Bartlett, Leonie Simpson, Kenneth Koon-Ho Wong, Ed Dawson
Erschienen in: Information Security and Privacy
Verlag: Springer Berlin Heidelberg
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An initialisation process is a key component in modern stream cipher design. A well-designed initialisation process should ensure that each key-IV pair generates a different keystream. In this paper, we analyse two ciphers, A5/1 and Mixer, for which this does not happen due to state convergence. We show how the state convergence problem occurs and estimate the effective key-space in each case.