Download Advances in Information and Computer Security: Third by Maciej Grześkowiak (auth.), Kanta Matsuura, Eiichiro PDF

By Maciej Grześkowiak (auth.), Kanta Matsuura, Eiichiro Fujisaki (eds.)

ISBN-10: 3540895973

ISBN-13: 9783540895978

This e-book constitutes the refereed complaints of the 3rd foreign Workshop on protection, IWSEC 2008, held in Kagawa, Japan, in November 2008.

The 18 revised complete papers awarded including 1 invited speak have been conscientiously reviewed and chosen from ninety four submissions. The papers are prepared in topical sections on cryptography, signature and signcryption, software program safeguard, privateness defense and contents safeguard, authentication and entry keep an eye on, in addition to implementation.

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Extra info for Advances in Information and Computer Security: Third International Workshop on Security, IWSEC 2008, Kagawa, Japan, November 25-27, 2008. Proceedings

Sample text

Bk ) ∈ Z2k+2 p b a 2. B sets Z = g α , and (Xi , Yi ) = (g ai , (g α ) i ) if vi = 0, or (Xi , Yi ) = ((g α ) i , g bi ) if vi = 1, for i = 0, . . , k. 3. B inputs public key P K = (G, g, X0 , . . , Xk , Y0 , . . , Yk , Z) and challenge ciphertext ψ = (g β , (g β )µ0 , . . , (g β )µk , γ) to A where µi = ai if vi = 0, or µi = bi if vi = 1 for i = 0, . . , k. Notice that ψ is a valid ciphertext for plaintext γ ⊕ h(g αβ ) ∈ {0, 1}. We also note that since the pair of plaintexts (M0 , M1 ) which are challenged is always (0, 1), without loss of generality B may give ψ to A at this stage.

We also show some experimental results against 2IC- schemes under the condition that secret transformations are linear at the Table 6. 6 Conclusion We proposed a practical attack against the IC schemes. This attack can be applied to the IC- signature scheme under the most general condition that secret transformations are affine. Also, oddIC− schemes (with affine secret transformations) for small are efficiently broken by our proposed attack. Furthermore, we carried out computational experiments of the attack against 3IC- signature scheme with the recommended parameters in [4] and showed that forging a signature is efficiently computable.

Springer, Heidelberg (2004) 27. : Public-key cryptosystems provably secure against chosen ciphertext attacks. In: Proc. of STOC 1990, pp. 427–437 (1990) 28. : The gap-problems: a new class of problems for the security of cryptographic schemes. -c. ) PKC 2001. LNCS, vol. 1992, pp. 104–118. Springer, Heidelberg (2001) 29. : REACT: rapid enhanced-security asymmetric cryptosystem transform. In: Naccache, D. ) CT-RSA 2001. LNCS, vol. 2020, pp. 159–175. Springer, Heidelberg (2001) 30. : About the security of ciphers (semantic security and pseudo-random permutations).

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