Security

Designated Verifier Threshold Proxy Signature Scheme without Random Oracles

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Executive Summary

In a (t; n) designated verifier threshold proxy signature scheme, an original signer can delegate his/her signing power to n proxy signers such that any t or more out of n proxy signers can sign messages on behalf of the original signer but t-1 or less of the proxy signers cannot generate a valid proxy signature. Of course, the signature is issued for a designated receiver and therefore only the designated receiver can validate the proxy signature. In this paper, the authors propose a new designated verifier threshold proxy signature scheme and also show that the pro-posed scheme has provable security in the standard model.

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