By Mike V. D. Burmester, Yvo Desmedt (auth.), Ivan Bjerre Damgård (eds.)
Eurocrypt is a convention dedicated to all points of cryptologic learn, either theoretical and useful, backed by way of the foreign organization for Cryptologic learn (IACR). Eurocrypt ninety came about in Åarhus, Denmark, in could 1990. From the eighty five papers submitted, forty two have been chosen for presentation on the convention and for inclusion during this quantity. as well as the formal contributions, brief abstracts of a couple of casual talks are integrated in those court cases. The court cases are geared up into periods on protocols, number-theoretic algorithms, boolean features, binary sequences, implementations, combinatorial schemes, cryptanalysis, new cryptosystems, signatures and authentication, and impromptu talks.
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Extra info for Advances in Cryptology — EUROCRYPT ’90: Workshop on the Theory and Application of Cryptographic Techniques Aarhus, Denmark, May 21–24, 1990 Proceedings
A bit commitment protocol is a fundamental %-partycryptographic protocol. It allows one party A to hide (commit) onc bit 6 from the other party B and, later, to show (decommit) it to B. Even though B does not know which bit A has committed to, he is guarantced that the bit dccommitted is the bit A originally committed to. If B is poly-time, the bit commitment can be implemented as: A chooses a secure encryption schemc (in the sensc of [GM]) and commits to a bit by encrypting it. B, being poly-time, cannot decrypt and computc b.
If Bob sees two heads he knows that Alice’s bit was one but if he sees one head and one tail he does not know which of the two was Alice’s choice and which was still wrapped when Alice put it in the tray. Need for an Initializing Protocol Basically our protocol works with two coins for a one bit message. Alice chooses the upper side of one coin accordii to her message and the other is 35 thrown such thatthe Alice, the sender cannot see which side is up and such that Bob, the recipient, sees both coins but cannot see which was thrown and which was chosen.
In the final paper we give a partial solution to it hascd on k-wisc indepcndcncc. I - o u t 4 Oblivious Transfer. An immediate geiicralization of the I-out-3 OT is tlie 1-out-k OT. ,~k-~, in such a way that (1) B docs not get any information on the othcr k - 1 strings, and (2) A does not know which string B got. Our protocol can be easily modified to implement a 1-out-k OT. ,2 i - I E Z:’, such that exactly ~ui,), one z; is a quadratic non rcsiduc. z:-1, Sli, = (prime factors of xu), where \/do = (Non-Interactive Zero-Knowledge proof, in thc scnsc or [BFM], t h a t PI<, has been correctly computed).
Advances in Cryptology — EUROCRYPT ’90: Workshop on the Theory and Application of Cryptographic Techniques Aarhus, Denmark, May 21–24, 1990 Proceedings by Mike V. D. Burmester, Yvo Desmedt (auth.), Ivan Bjerre Damgård (eds.)