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An Improved Threshold Proxy Signature Scheme

Authors:
Akanksha Gupta
Prakash D. Vyavahare
Manish Panchal

Keywords: Proxy signature, Threshold signature, secret sharing, RSA

Abstract:
Threshold proxy signature schemes allow original signer to delegate his signing capability to a group of n proxy signers in which t, (1 < t ≤ n) or more proxy signers out of n can generate a valid proxy signature on behalf of original signer. The first Rivest, Shamir and Adleman (RSA) based threshold proxy signature scheme was proposed by Hwang et. al. . Later on Wang in his paper, commented on the security weakness in Hwang’s scheme. In this paper, we propose a new RSA based scheme that removes weakness of Hwang’s scheme. The proposed scheme employs efficient generation of shared RSA key using algorithm proposed by Boneh and Fanklin and RSA threshold cryptosystem of Nguyen. The proposed scheme provides secrecy, unforgeabilty, nonrepudiation, proxy protection and removes the need of trusted combiner. Therefore, it can be a potential candidate for implementation of electronic proxy signature system.

Pages: 49 to 54

Copyright: Copyright (c) IARIA, 2015

Publication date: August 23, 2015

Published in: conference

ISSN: 2162-2116

ISBN: 978-1-61208-427-5

Location: Venice, Italy

Dates: from August 23, 2015 to August 28, 2015