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On Distributed Cryptographic Protocols for Threshold RSA Signing and Decrypting with No Dealer

Shingo MIYAZAKI, Kouichi SAKURAI, Moti YUNG

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Summary :

We consider methods for threshold RSA decryption among distributed agencies without any dealer or trusted party. The first solution is a combination of two techniques by [9] and [7] . It demonstrates the feasibility of combining the distributed key generation and the RSA secure function application. The second solution is another approach making the distributed key distribution simpler and alleviating a burden of each shareholder in comparison with the first scheme. The latter scheme is newly developed technique based on [9] and further inspired by Simmons' protocol-failure of RSA (we believe that it is very interesting that a "protocol failure attack" be turned into a constructive method). Our comparison between these two schemes indicates a new measure of the performance of a distributed cryptographic protocol that consists of multiple stages.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E84-A No.5 pp.1177-1183
Publication Date
2001/05/01
Publicized
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Type of Manuscript
Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
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