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Title:
SQUARE Attacks on Reduced-Round PES and IDEA Block Ciphers
Authors: J. Nakahara Jr, P. S. L. M. Barreto, B. Preneel, J. Vandewalle, 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.
ePrint: https://eprint.iacr.org/2001/068
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