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Many of the public key cryptosystems deal with two-party communication keeping confidentiality and authentication as primary goals. However, there are many applications like banking that require multi-party communication. In bank, the people keep valuable articles in lockers. The authors need two dependent keys to open the locker. In corporate sector it may be thought of as multi-party communication. RSA provided multi-party communication using shared key approach. But the overhead of RSA seem to be more because it has to choose n pairs of numbers such that the summation of these numbers is a large prime number.
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