Advances in Information and Computer Security: First by Man Ho Au, Joseph K. Liu, Tsz Hon Yuen, Duncan S. Wong

By Man Ho Au, Joseph K. Liu, Tsz Hon Yuen, Duncan S. Wong (auth.), Hiroshi Yoshiura, Kouichi Sakurai, Kai Rannenberg, Yuko Murayama, Shinichi Kawamura (eds.)

ItwasourpleasuretoholdtheInternationalWorkshoponSecurity2006(IWSEC 2006) this yr in Kyoto and to submit the lawsuits as a quantity of the Lecture Notes in laptop technology sequence. The workshop used to be our ?rst trial in that significant educational society teams on defense in Japan, viz. ISEC and CSEC, together geared up it; ISEC is a te- nical workforce on info safeguard of the Institute of Electronics, info and verbal exchange Engineers (IEICE), and CSEC is a unique curiosity staff on laptop safety of the knowledge Processing Society of Japan (IPSJ). It used to be Ryoichi Sasaki, the previous head of CSEC, who proposed protecting such a global workshop in Japan for the ?rst time, years in the past. the 2 teams supported his proposal and commenced organizing the workshop. CSEC has its annual family symposium, the pc safety Symposium (CSS), in - tober for 3 days, and we determined to prepare the workshop ahead of CSS this 12 months. The preliminary target of the workshop used to be essentially to supply younger researchers with the chance to give their paintings in English. although, because of extra submissions than we had expected, the standard of the authorized papers grew to become much better than we had anticipated. Theconferencereceived147submissions,outofwhichtheprogramcommittee chosen 30 for presentation. those complaints include the ?nal models of the accredited papers, which the authors ?nalized at the foundation of reviews from the reviewers. due to the fact that those revisions weren't topic to editorial assessment, the authors undergo complete accountability for the contents in their papers.

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Extra info for Advances in Information and Computer Security: First International Workshop on Security, IWSEC 2006, Kyoto, Japan, October 23-24, 2006. Proceedings

Example text

This hash function is probabilistic and therefore it needs a verification function, just as in a signature scheme. A hash scheme consists of two algorithms H and V. The probabilistic algorithm H : Param × Str → Str takes a unary sequence and a message and outputs a hash value; the verification algorithm V : Str × Str → {0, 1} that given two messages x and c correctly decides whether c is a hash of x or not. As an example we reproduce here a hash scheme proposed in the original paper. , scaling with η) safe prime.

A (probabilistic) encryption algorithm E : Keys×Str → Ciphertext∪{⊥} that outputs, given a key and a bit string, a possibly randomly chosen element from Ciphertext or ⊥; 3. a (deterministic) decryption algorithm D : Keys × Str → Plaintext ∪ {⊥} that outputs, given a key and a ciphertext, an element from Plaintext or ⊥. These algorithms must satisfy that the decryption (with the correct key) of a ciphertext returns the original plaintext. The element ⊥ is used to indicate failure of en- or decryption, although there is no requirement that decrypting with the wrong keys yields ⊥.

We extend the well-known Abadi-Rogaway logic with probabilistic hashes and we give a precise semantic interpretation to it using Canetti’s oracle hashes. These are probabilistic polynomialtime hashes that hide all partial information. Finally, we show that this interpretation is computationally sound. 1 Introduction The analysis of security protocols is being carried out mainly by means of two different techniques. On the one hand, from a logical perspective, messages are seen as algebraic objects, generated by some grammar from elementary objects such as keys, nonces, and constants.

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