Paper 2005/257

TMD-Tradeoff and State Entropy Loss Considerations of Streamcipher MICKEY

Jin Hong and Woo-Hwan Kim

Abstract

We give three weaknesses of a recently proposed streamcipher MICKEY. A small class of weak keys is found and we show time-memory-data tradeoff is applicable. We also show that the state update function reduces entropy of the internal state as it is iterated, resulting in keystreams that start out differently but become merged together towards the end.

Metadata
Available format(s)
PDF PS
Category
Secret-key cryptography
Publication info
Published elsewhere. Presented at Indocrypt 2005 (LNCS 3797, pp. 169-182)
Keywords
MICKEYstream ciphertime memory data tradeoffinternal state entropyweak key
Contact author(s)
whkim5 @ ensec re kr
History
2008-08-06: revised
2005-08-11: received
See all versions
Short URL
https://ia.cr/2005/257
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2005/257,
      author = {Jin Hong and Woo-Hwan Kim},
      title = {TMD-Tradeoff and State Entropy Loss Considerations of Streamcipher MICKEY},
      howpublished = {Cryptology ePrint Archive, Paper 2005/257},
      year = {2005},
      note = {\url{https://eprint.iacr.org/2005/257}},
      url = {https://eprint.iacr.org/2005/257}
}
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