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

This booklet constitutes the completely refereed post-conference lawsuits of the second one foreign convention on details Theoretic protection, ICITS 2007, held in Madrid, Spain, in may perhaps 2007.

The thirteen revised complete papers awarded during this quantity have been conscientiously reviewed and chosen from 26 submissions. there have been one invited keynote speech and three invited talks to the convention. the themes lined are authentication, team cryptography, inner most 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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Verification Algorithm by User: For a message-signature pair (m, σ), (j,t) where σ = (d(j,t) , r) and euk ∈ Eu , the algorithm U V er picks up Hk (z) (j,t) and vk corresponding d(j,t) from euk , and outputs valid if β(y)|y=v(j,t) = k (j,t) Hk (z)|z=m holds and otherwise outputs invalid. 6. Verification Algorithm by Signer: For a message-signature pair (m, σ), (j,t) where σ = (d(j,t) , r) and es ∈ Es , the algorithm SV er picks up Hs (z) (j,t) and vs corresponding d(j,t) from es , and outputs valid if β(y)|y=v(j,t) = s (j,t) Hs (z)|z=m holds and otherwise outputs invalid.

When some steps have two similar flows, these are further distinguished with letters ’a’ and ’b’. (CP1) (CP2) Alice (a) and Bob (b) receive a secret key1 by some secure channel. A message is sent from Alice to Bob (a) and possibly also read by Eve (b). In an authentication system as described above, there are the following flows: (AC1) (AC2) Alice (a) and Bob (b) receive a secret key by some secure channel. A message is sent from Alice to Oscar (a), who may change it before relaying it to Bob (b)2 .

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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