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We propose a fair novel concurrent signature scheme. It resolves the existing problems in traditional concurrent signature schemes, that is initial signer (A) has some advantages over matching signer (B), such as A could show B's ambiguous signature and the keystone to a third party in private to demonstrate B's binding signature but B can not, or A could keep the keystone secret and B do not have...
As a special anonymous signature, the blindness of blind signatures is an important property which distinguishes from the other signatures. And it makes it play an important role in electronic commerce. Recently, Huang et. al proposed several Schnorr Type ID-based blind signature schemes and claimed that these schemes were secure. Unfortunately, in the paper, we discuss the security of the first scheme...
Digital signature is an important cryptographical tool. In a digital signature with using self-certified public key, the verification signature and public key can be carried out in a logic step. Recently, Tseng et al proposed a digital signature schemes with using self-certified public key. Unfortunately, Shao et.al showed that the scheme was insecure, and gives an improvement scheme. In this works,...
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