Download Advances in Cryptology - CRYPTO 2007: 27th Annual by Vivien Dubois, Pierre-Alain Fouque, Adi Shamir, Jacques PDF

By Vivien Dubois, Pierre-Alain Fouque, Adi Shamir, Jacques Stern (auth.), Alfred Menezes (eds.)

The twenty seventh Annual foreign Cryptology convention used to be held in Santa Barbara, California, in August 2007. The convention drew researchers from around the globe who got here to offer their findings and speak about the most recent advancements within the box. This ebook constitutes the refereed court cases of the conference.

Thirty-three complete papers are awarded besides one vital invited lecture. every one has been rigorously reviewed via the editor to make sure that all papers are exact, effortless to learn, and make a big contribution to the field.

The papers deal with present foundational, theoretical, and study features of cryptology, cryptography, and cryptanalysis. additionally, readers will realize many complicated and rising applications.

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Read or Download Advances in Cryptology - CRYPTO 2007: 27th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 19-23, 2007. Proceedings PDF

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Extra resources for Advances in Cryptology - CRYPTO 2007: 27th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 19-23, 2007. Proceedings

Example text

The probability is taken over the random choice of sn . That is, the probability that A returns the same output on two inputs is at least some constant times the resemblance between Pn (x) and Pn (y). 3. If x ≡P y then A(sn , x) = A(sn , y) for all seeds sn . That is, if x and y are equivalent then A always returns the same output on x and on y. If c = 1 in the above Requirement 2, then A(·, ·) is perfect resemblance preserving with respect to P. Unlike Definition 9, in the definition of resemblance preserving algorithms we do not know how to formulate this privacy using an “ideal world”.

Full Key-Recovery Attacks on HMAC/NMAC-MD4 and NMAC-MD5 23 (b) Observe if NMACk1 ,k2 (M ) = NMACk1 ,k2 (M Δ1 ) for some M and a well-chosen Δ1 . (c) Deduce information on k2 . 2. Apply a composite IV-recovery attack to retrieve k1 , repeating sufficiently many times: (a) Construct carefully many pairs (M1 , M2 ). (b) Observe if NMACk1 ,k2 (M1 ) = NMACk1 ,k2 (M2 ) for some pair (M1 , M2 ). (c) Deduce information on k1 . 1 Attacking HMAC/NMAC-MD4 Our IV-Recovery Attack Against MD4 In order to find differential paths which leak information about the key, we consider differential paths with a message difference in the first word (eg.

Then we know [k s ] [k s ] [k s ] [k s ] 22 bits of the IV (Q−1 0 = Q−2 0 or Q−1 0 = Q−2 0 ), which leaves only 2106 IV candidates. To check if a given IV is the correct one, we just check whether it gives a collision on the pairs colliding with the real IV, so we expect to find the IV after computing 2105 pairs of hashes in an offline phase. 2 how to reduce the search space to 294 keys by extracting more than one bit of information when a collision is found. This gives an IV-recovery attack against MD4 with a data complexity of 288 MD4 oracle queries, and a time complexity of 294 MD4 evaluations.

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