Information Theoretic Security: Second International by Alexandre Pinto, André Souto, Armando Matos, Luís Antunes

By Alexandre Pinto, André Souto, Armando Matos, Luís Antunes (auth.), Yvo Desmedt (eds.)

This e-book constitutes the completely refereed post-conference court cases of the second one foreign convention on info Theoretic safeguard, ICITS 2007, held in Madrid, Spain, in may possibly 2007.

The thirteen revised complete papers provided during this quantity have been rigorously reviewed and chosen from 26 submissions. there have been one invited keynote speech and three invited talks to the convention. the subjects coated are authentication, crew cryptography, deepest and trustworthy message transmission, mystery sharing, and purposes of data theory.

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Additional resources for Information Theoretic Security: Second International Conference, ICITS 2007, Madrid, Spain, May 25-29, 2007, Revised Selected Papers

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In: Proc. of CRYPTO 1982, pp. 199–204. Prenum Publishing Corporation (1982) 7. : Untraceable electronic cash. In: Goldwasser, S. ) CRYPTO 1988. LNCS, vol. 403, pp. 319–327. Springer, Heidelberg (1990) 8. : Unconditionally secure digital signature schemes admitting transferability. In: Okamoto, T. ) ASIACRYPT 2000. LNCS, vol. 1976, pp. 130–142. Springer, Heidelberg (2000) 9. : Security of blind digital signatures. S. ) CRYPTO 1997. LNCS, vol. 1294, pp. 150–164. Springer, Heidelberg (1997) 10. : Unconditionally secure encryption under strong attacks.

Log q and lEs = ntu (3ω +8) log q, where lΣ , lΣ ∗ , lEu and lEs are bit length of signatures for messages, signatures for blinded messages, users’ secret keys and the signer’s secret keys, respectively. 5 Concluding Remarks In this paper, we studied blind signature schemes from the viewpoint of unconditional security setting. Specifically, we newly introduced a model of unconditionally secure blind signatures. Also, we proposed security notions and their formalizations in our model. In addition, we provided a construction method that was provably secure in our strong security notions.

Lemma 1. PF is at most 2 q−2tv +2 . Proof. Without loss of generality it is sufficient to prove PF1 is at most q−2t2v +2 . , Uω } be a set of colluders. , n − 1). We note that the proposed construction consists of tu n independent signing-keys, blinding-keys, unblinding-keys and verification-keys, hence when W tries to produce a fraudulent message-signature pair (m , σ ) with σ = (d(i,t) , r ), obtained messagesignature pairs and pairs of blinded message and its signature are not valuable except for them corresponding to d(i,t) .

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