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.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
ECRYPT, ECRYPT yearly report on algorithms and keysizes (2004). Version 1.1 (March 2005), Available from http://www.ecrypt.eu.org
ECRYPT, eSTREAM - the ECRYPT Stream Cipher Project. Information available from http://www.ecrypt.eu.org/stream/
Babbage, S.H.: Improved exhaustive search attacks on stream ciphers. In: European Convention on Security and Detection, IEE Conference publication, vol. 408, pp. 161–166. IEE (1995)
Babbage, S., Dodd, M.: The stream cipher MICKEY (version 1). ECRYPT Stream Cipher Project Report 2005/015 (2005), Available from [2]
Biryukov, A., Shamir, A.: Cryptanalytic time/memory/data tradeoffs for stream ciphers. In: Okamoto, T. (ed.) ASIACRYPT 2000. LNCS, vol. 1976, pp. 1–13. Springer, Heidelberg (2000)
Biryukov, A., Shamir, A., Wagner, D.: Real time cryptanalysis of A5/1 on a PC. In: Schneier, B. (ed.) FSE 2000. LNCS, vol. 1978, pp. 1–18. Springer, Heidelberg (2001)
Flajolet, P., Odlyzko, A.M.: Random mapping statistics. In: Quisquater, J.-J., Vandewalle, J. (eds.) EUROCRYPT 1989. LNCS, vol. 434, pp. 329–354. Springer, Heidelberg (1990)
Golić, J.D.: Cryptanalysis of alleged A5 stream cipher. In: Fumy, W. (ed.) EUROCRYPT 1997. LNCS, vol. 1233, pp. 239–255. Springer, Heidelberg (1997)
Hellman, M.E.: A cryptanalytic time-memory trade-off. IEEE Trans. on Infor. Theory 26, 401–406 (1980)
Menezes, A.J., van Oorschot, P.C., Vanstone, S.A.: Handbook of Applied Cryptography. CRC Press, Boca Raton (1997)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2005 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Hong, J., Kim, WH. (2005). TMD-Tradeoff and State Entropy Loss Considerations of Streamcipher MICKEY. In: Maitra, S., Veni Madhavan, C.E., Venkatesan, R. (eds) Progress in Cryptology - INDOCRYPT 2005. INDOCRYPT 2005. Lecture Notes in Computer Science, vol 3797. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11596219_14
Download citation
DOI: https://doi.org/10.1007/11596219_14
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-30805-8
Online ISBN: 978-3-540-32278-8
eBook Packages: Computer ScienceComputer Science (R0)