Download Advances in Cryptology – CRYPTO 2012: 32nd Annual Cryptology by Viet Tung Hoang, Ben Morris, Phillip Rogaway (auth.), PDF

By Viet Tung Hoang, Ben Morris, Phillip Rogaway (auth.), Reihaneh Safavi-Naini, Ran Canetti (eds.)

This booklet constitutes the refereed lawsuits of the thirty second Annual overseas Cryptology convention, CRYPTO 2012, held in Santa Barbara, CA, united states, in August 2012. The forty eight revised complete papers offered have been rigorously reviewed and chosen from 225 submissions. the amount additionally comprises the abstracts of 2 invited talks. The papers are equipped in topical sections on symmetric cryptosystems, safe computation, attribute-based and practical encryption, proofs platforms, protocols, hash capabilities, composable safety, 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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Fix k, n > 0 and let E : {0, 1}k × {0, 1}n × {0, 1}n → {0, 1}n be a tweakable blockcipher. Fix T0 ∈ {0, 1}n. Then for any key K ∈ {0, 1}k and a plaintext M = M1 , . . b]. This is the TBC-MAC (over E) of the input M . It is intuitive to think of TBC-MAC as analogous to CBC-MAC. Indeed, if EK (T, X) = EK (T ⊕ X) then we have the CBC-MAC construction. But perhaps by abstracting away the details of E one can achieve better security than that offered by CBC-MAC? This seems a reasonable expectation, since an attacker can directly influence the input to the blockcipher E in CBC-MAC via the exclusive-or operation, but no such influence is guaranteed when the chaining value (the tweak) is separated from the plaintext input block.

4596, pp. 399–410. Springer, Heidelberg (2007) 4. : Improved Security Analyses for CBC MACs. In: Shoup, V. ) CRYPTO 2005. LNCS, vol. 3621, pp. 527–545. Springer, Heidelberg (2005) 5. : The Security of Triple Encryption and a Framework for Code-Based Game-Playing Proofs. In: Vaudenay, S. ) EUROCRYPT 2006. LNCS, vol. 4004, pp. 409–426. Springer, Heidelberg (2006) 6. : MAC Reforgeability. In: Dunkelman, O. ) FSE 2009. LNCS, vol. 5665, pp. 345–362. Springer, Heidelberg (2009) 7. : An analysis of the blockcipherbased hash functions from PGV.

The set of n-bit strings, {0, 1}n, is also regarded as GF(2n ), the finite field with 2n elements. An n-bit string an−1 . . a1 a0 ∈ {0, 1}n corresponds to a formal polynomial a(x) = an−1 + an−2 x + · · · + a1 xn−2 + a0 xn−1 ∈ GF(2)[x]. When n = 128, the irreducible polynomial used in GCM is p(x) = 1 + x + x2 + x7 + x128 . 3 Specification of GCM We follow [27,28] with some notational changes. GCM is parameterized by a blockcipher E : K × {0, 1}n → {0, 1}n and a tag length τ , where 64 ≤ τ ≤ n. We write GCM[E, τ ] for GCM that uses E and τ as parameters.

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