Title: Changeable Threshold Signature Scheme without a Trusted Center
Abstract: Analyses are made on Lee's threshold signature scheme with multiple signing policies,which shows his scheme suffers from allied cheating attack.Then,based on Agnew et al.'s improved ElGamal signature algorithm,a changeable threshold signature scheme without a trusted center is proposed.Multiple group secret keys with different threshold values are shared among a group of signers,and each signer needs to keep only one secret key and one secret value.Different group secret keys can be flexibly chosen to securely sign documents depending on their significance.Analysis results show that the proposed scheme can protect the signature from allied cheating attack and the key management is very simple since there is no trusted center.Therefore,the proposed scheme is more secure and capable of providing more practicability than the existing schemes.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 5
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