Paper 2001/068
SQUARE Attacks on Reduced-Round PES and IDEA Block Ciphers
J.Nakahara Jr and P.S.L.M.Barreto and B.Preneel and J.Vandewalle and H.Y.Kim
Abstract
This paper reports on variants of the Square attack applied to reduced-round versions of the PES and IDEA block ciphers. Attacks on 2.5 rounds of IDEA require $3\cdot 2^{16}$ chosen-plaintexts and recover 78 key bits. A new kind of attack, the Square related-key attack, is applied on 2.5 rounds of IDEA and recovers 32 key bits, with 2 chosen-plaintexts and $2^{17}$ related keys. Similar results hold for 2.5 rounds of PES. Implementations of the attacks on 32-bit block mini-versions of both ciphers confirmed the expected computational complexity. Although our attacks do not improve on previous approaches, this report shows new variants of the Square attack on word-oriented block ciphers like IDEA and PES.
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Metadata
- Available format(s)
- PDF PS
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- block cipherscryptanalysissecret-key cryptography
- Contact author(s)
- jorge nakahara @ esat kuleuven ac be
- History
- 2001-08-22: revised
- 2001-08-14: received
- See all versions
- Short URL
- https://ia.cr/2001/068
- License
-
CC BY