Coalition Public-Key Cryptosystems

Authors:
A. V. Anisimov
Affiliations:
Taras Shevchenko State University, Kiev, Ukraine
Venue:
Cybernetics and Systems Analysis
Year:
2001

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Abstract

A coalition is understood to be a group of participants (coalitionists) who can collaborate in order to achieve common objectives. The basic principle of a coalition is the absence of a threat to communication flows within the coalition from its participants. In this paper, two new RSA coalition protocols are considered. According to the first protocol, only one participant in a coalition (called its leader) generates an RSA scheme for the other participants. In this case, an ordinary participant should send only one arbitrary number to the leader over a secure channel. In the other version, the general parameters of the RSA scheme being used are transmitted from the leader to a participant over a secure channel. This makes it possible to use very small keys and to substantially increase the data rate.