Download Cryptology and Network Security: 11th International by Michael Lehmann, Willi Meier (auth.), Josef Pieprzyk, PDF

By Michael Lehmann, Willi Meier (auth.), Josef Pieprzyk, Ahmad-Reza Sadeghi, Mark Manulis (eds.)

This booklet constitutes the refereed complaints of the eleventh foreign convention on Cryptology and community defense, CANS 2012, held in Darmstadt, Germany, in December 2012. The 22 revised complete papers, awarded have been rigorously reviewed and chosen from ninety nine submissions. The papers are equipped in topical sections on cryptanalysis; community protection; cryptographic protocols; encryption; and s-box theory.

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Extra resources for Cryptology and Network Security: 11th International Conference, CANS 2012, Darmstadt, Germany, December 12-14, 2012. Proceedings

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The basic idea of the attack is very simple. Since in McOE-X the key is changed for every block of message that is encrypted, an adversary can recover the key by keeping the message input of some block cipher operation fixed and using a time-memory trade-off strategy. In its best setting the attack has a complexity as low as 2 · 2n/2 with similar memory requirements, while this should be 2n in the ideal case. Our attack allows a free trade-off between memory (precomputation) and time (online phase), and as such can be tailored to different attack scenarios.

Springer, Heidelberg (2010) 19. : Dimension Reduction Methods for Convolution Modular Lattices. H. ) CaLC 2001. LNCS, vol. 2146, pp. 110–125. Springer, Heidelberg (2001) 20. : Cryptanalysis of the Ajtai-Dwork Cryptosystem. In: Krawczyk, H. ) CRYPTO 1998. LNCS, vol. 1462, pp. 223–242. Springer, Heidelberg (1998) 21. : The rise and fall of knapsack cryptosystems. Cryptology and Computational Number Theory 42, 75–88 (1990) 22. : Broadcast Attacks against Lattice-Based Cryptosystems. , Vergnaud, D.

They showed that the strongest notion of security for authenticated encryption can only be achieved by the EtM approach. However, schemes built from generic composition have some disadvantages. Besides that two different algorithms with two different keys are needed, the message needs to be processed twice, making the scheme impractical for some applications. Therefore, ISO/IEC specifies, next to the generic composition EtM, five authenticated encryption modes for block ciphers, namely OCB, SIV (Key Wrap), CCM, EAX, and GCM.

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