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Paper 2002/152

A note on Weak Keys of PES, IDEA and some Extended Variants

Jorge Nakahara Jr and Bart Preneel and Joos Vandewalle

Abstract

This paper presents an analysis of the PES cipher in a similar setting as done by Daemen et al. at Crypto'93 for IDEA. The following results were obtained for 8.5 round PES: a linear weak-key class of size $2^{48}$; two distinct differential weak-key classes of size $2^{41}$; two differential-linear weak-key classes of size $2^{62}$. For 17-round PES (double-PES): a linear weak-key class of size $2^7$, and a differential weak-key class of size $2^7$ were found. Daemen suggested a modified key schedule for IDEA in order to avoid weak keys. We found a differential weak-key class of size $2^{83}$ for 2.5-round IDEA under his redesigned key schedule, and differential-linear relations for 3.5-round IDEA.

Note: comments are welcome !

Metadata
Available format(s)
PDF PS
Category
Secret-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
cryptanalysisblock ciphers
Contact author(s)
jorge nakahara @ esat kuleuven ac be
History
2002-10-15: received
Short URL
https://ia.cr/2002/152
License
Creative Commons Attribution
CC BY
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