By Viet Tung Hoang, Ben Morris, Phillip Rogaway (auth.), Reihaneh Safavi-Naini, Ran Canetti (eds.)
This booklet constitutes the refereed complaints of the thirty second Annual foreign Cryptology convention, CRYPTO 2012, held in Santa Barbara, CA, united states, in August 2012. The forty eight revised complete papers provided have been conscientiously reviewed and chosen from 225 submissions. the quantity additionally includes the abstracts of 2 invited talks. The papers are prepared in topical sections on symmetric cryptosystems, safe computation, attribute-based and sensible encryption, proofs structures, protocols, hash capabilities, composable defense, privateness, leakage and side-channels, signatures, implementation research, black-box separation, cryptanalysis, quantum cryptography, and key encapsulation and one-way functions.
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Extra resources for Advances in Cryptology – CRYPTO 2012: 32nd Annual Cryptology Conference, Santa Barbara, CA, USA, August 19-23, 2012. Proceedings
The permutations π1 and π2 are constructed lazily, while h1 and h2 are already deﬁned. Initially, boolean variables have the value false. Note that E is the dual of E −1 , in the sense that Eh−1 (Y, T ) = 1 ,h2 ,π1 ,π2 Eh2 ,h1 ,π−1 ,π−1 (Y, T ). When arguing that transitions between games are correct, 2 1 we will exploit this duality by limiting our discussion to changes in the encryption oracle, and hence to queries made to that oracle; the arguments used to justify the corresponding changes in the decryption oracle are practically identical.
Breaking and Repairing GCM Security Proofs I ← N 031 1 GHASHL (ε, N ) inc EK I inc 35 if |N | = 96 if |N = 96 I inc I[m] EK EK EK S S S[m] CTRK M msb|M | S msbτ C T GHASHL (A, C) Fig. 3. The encryption algorithm of GCM outputs 1. The resources of A are measured in terms of time and query complexities. The time complexity includes the description size of A, and we ﬁx a model of computation and a method of encoding. The query complexity includes the number of queries, the total length of queries, and the maximum length of queries, and a more precise deﬁnition is given in each theorem statement.
Bellare and Ristenpart  study unforgeability preservation of iterated MerkleDamg˚ ard constructions in the dedicated-key compression-function setting. They show that, in general, these iterations do not preserve unforgeability; however, their counterexample does not apply to TBC-MAC because the compression function they construct is not a TBC. Zhang et al.  study so-called rate-1 MACs constructed from variations of the PGV [26, 7] blockcipher-based compression functions. They show that certain of these compression functions, for example f (T, X) = EK ⊕ T (X), iterate (through T ) to unforgeable MACs under the assumption that the underlying blockcipher is related-key unpredictable for speciﬁc related-key functions.
Advances in Cryptology – CRYPTO 2012: 32nd Annual Cryptology Conference, Santa Barbara, CA, USA, August 19-23, 2012. Proceedings by Viet Tung Hoang, Ben Morris, Phillip Rogaway (auth.), Reihaneh Safavi-Naini, Ran Canetti (eds.)