By B. Preneel (auth.), Carlo Blundo, Stelvio Cimato (eds.)
The 4th overseas convention on safety in verbal exchange Networks 2004 (SCN2004)washeldatthe“DioceseHall”oftheArchdioceseofAmal?-Cavade’ Tirreni and the “Armorial Bearings corridor” of the Archbishop Palace in Amal?, Italy, on September 8–10, 2004. prior meetings additionally happened in Amal? in 1996, 1999 and 2002. The convention aimed toward bringing jointly researchers within the ?elds of cr- tography and safeguard in verbal exchange networks to foster cooperation and the alternate of principles. the most issues incorporated all technical elements of information safety, together with: anonymity,authentication,blockciphers,complexity-basedcryptography,cry- research, electronic signatures, disbursed cryptography, hash features, identi?- tion,implementations,keydistribution,privacy,publickeyencryption,threshold cryptography, and 0 wisdom. this system Committee, which include 21 individuals, thought of seventy nine papers and chosen 26 for presentation; certainly one of them was once withdrawn by means of the authors. those papers have been chosen at the foundation of originality, caliber and relevance to cryptography and safeguard in conversation networks. a result of excessive variety of submissions, paper choice was once a di?cult and tough activity, and plenty of strong submissions needed to be rejected. each one subm- sion used to be refereed by means of not less than 3 reviewers and a few had 4 stories or extra. we're very thankful to the entire application committee participants, who dedicated a lot e?ort and important time to learn and choose the papers. additionally, we gratefully recognize the aid of colleagues who reviewed submissions of their components of craftsmanship. they're all indexed on web page VII and we ask for forgiveness for any inadvertent omissions. those complaints contain the revised models of the 26 authorized papers andtheabstractoftheinvitedtalkbyBartPreneel(ECRYPT:theCryptographic study demanding situations for the subsequent Decade).
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Extra resources for Security in Communication Networks: 4th International Conference, SCN 2004, Amalfi, Italy, September 8-10, 2004, Revised Selected Papers
Example text
Lemma 16. is by a truly random function F. H. Phan and D. Pointcheval 44 Proof. As above, we start from an adversary against We prove that is small by exhibiting an IND-CCA2 adversary against with a similar advantage. Game In this first game, as above, exactly the same way: is provided with and plays Game We provide with instead of together with oracle access to but also the trapdoor to compute By the Proposition 15, can use this decryption oracle to perfectly simulate excepted on a query where is the challenge ciphertext for Fortunately, in this case, can safely output Indeed, it would be a mistake only if Note that is not known to and thus such a case can appear in the first stage only by chance (less than If this happens in the second stage, by randomly outputting a from a decryption query, one would break the PRF property of with probability of since one would output after only queries (since this critical decryption query is one of the possible queries of Game In this game, we replace the function by a truly random function F.
H. Phan and D. Pointcheval In the second stage, receives the challenge ciphertext where asks to and gets Then, for to the adversary asks and finally gets after decryption queries. As a last query, it asks to If the answer is the adversary returns 0, otherwise (in which case the answer is the adversary returns 1. It is easy to see that the value returned by the adversary is always equal to Lemma 14. is secure: for and Proof. Since is IND-CCA2 secure, it is also the case for We then prove that an adversary against can be used by an adversary to break the IND-CCA2 security level of with a similar advantage.
Bellare, A. Desai, D. Pointcheval, and P. Rogaway. Relations among Notions of Security for Public-key Encryption Schemes. In Adv. in Cryptology – Proceedings of Crypto ’98, volume LNCS 1462, pages 26–45, Berlin, 1998. Springer-Verlag. 3. M. Bellare and P. Rogaway. The Exact Security of Digital Signatures – How to Sign with RSA and Rabin. In Eurocrypt ’96, LNCS 1070, pages 399–416. SpringerVerlag, Berlin, 1996. 4. M. Bellare and A. Sahai. Non-malleable encryption: Equivalence between two notions, and an indistinguishability-based characterization.