Download PDF by Dan Boneh, Glenn Durfee (auth.), Jacques Stern (eds.): Advances in Cryptology — EUROCRYPT ’99: International

By Dan Boneh, Glenn Durfee (auth.), Jacques Stern (eds.)

ISBN-10: 354048910X

ISBN-13: 9783540489108

ISBN-10: 3540658890

ISBN-13: 9783540658894

This e-book constitutes the refereed lawsuits of the overseas convention at the thought and alertness of Cryptographic options, EUROCRYPT '99, held in Prague, Czech Republic in could 1999.
The 32 revised complete papers awarded have been rigorously chosen in the course of hugely aggressive reviewing technique. The e-book is split in topical sections on cryptanalysis, hash features, foundations, public key cryptosystems, watermarking and fingerprinting, elliptic curves, new schemes, block ciphers, disbursed cryptography, instruments from comparable parts, and broadcast and multicast.

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Additional resources for Advances in Cryptology — EUROCRYPT ’99: International Conference on the Theory and Application of Cryptographic Techniques Prague, Czech Republic, May 2–6, 1999 Proceedings

Example text

Cv9 given the inputs and outputs of the third G and of G’. Assuming that this solution costs about one computation of a G permutation, the total complexity of phase 3 is 249 · 232 (2 · 12 + 1) = 282 computations of a G permutation, which is equivalent to 282 /31 ≈ 277 encryptions. The complexity of phase 4 is about 280 /8 = 277 encryption. Therefore, the total complexity of the attack is about 278 encryptions, which is four times faster than exhaustive search. The average time complexity of the attack is about 277 , which is also four times faster than the average case of exhaustive search.

During the last five years, our understanding of MACs has improved considerably, through development of security proofs (Bellare et al. [3,5,6]) and new attacks (Knudsen [23] and Preneel and van Oorschot [30,31]). An important disadvantage of both digital signatures and MAC algorithms is that their security is only computational. That implies that an opponent with sufficient computing power can in principle forge a message. A second problem is that shortcut attacks might exist, which means that forging a message can be much easier than expected.

The average time complexity of the attack is about 277 , which is also four times faster than the average case of exhaustive search. An attack on the reduced variant consisting of rounds 2 to 32 requires fewer chosen plaintexts, and the same complexity. ). This attack can also be applied as a chosen ciphertext attack against the variant consisting of rounds 1 to 31 using 234 chosen ciphertext blocks. 6 Discussion and Conclusions The best complexities of our attack when applied to reduced-round variants of Skipjack are summarized in Table 1.

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Advances in Cryptology — EUROCRYPT ’99: International Conference on the Theory and Application of Cryptographic Techniques Prague, Czech Republic, May 2–6, 1999 Proceedings by Dan Boneh, Glenn Durfee (auth.), Jacques Stern (eds.)


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