A note on Weak Keys of PES , IDEA and someExtended
نویسندگان
چکیده
منابع مشابه
A Note on Weak Keys of PES, IDEA, and Some Extended Variants
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; two distinct differential weak-key classes of size 2; two differentiallinear weak-key classes of size 2. For 17-round PES (double-PES): a linear weak-key class of size 2, and a differentia...
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The block ciphers PES and IPES were originally designed with the ambition to become the successor of DES as a standard. In this paper we point out why this would be a bad idea. On one hand a new block cipher (called MMB) is proposed, that uses similar primitive operations as (I)PES but can be more efficiently implemented both in hardware and in software. On the other hand classes of weak keys (...
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The Potential Energy Surface PES of (H2)2 dimer has been investigated, using five simple rigid rotor models. These models are called: head to head, symmetric side to side, L , steplike and T model. All calculations were done at two levels of ab initio methods: MP2(Full) and QCISD (T,Full) using cc-pVTZ basis set at singlet state of spin multiplicity. The results of scanning PES were then fitte...
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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 3·2 chosen-plaintexts and recover 77 key bits with a time complexity of 2. A new kind of attack, the related-key Square attack, is applied to 2.5 rounds of IDEA and recovers 32 key bits, with two chosen-plaintexts and 2 related keys with ...
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Large weak key classes of IDEA are found for which membership is tested with a differential-linear test while encrypting with a single key. In particular, one in every 2'' keys for 8.5-round IDEA is weak. A related-key differential-linear attack on 4-round IDEA is presented which is successful for all keys. Large weak key classes are found for 4.5to 6.5-round and 8-round IDEA for which membersh...
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