On the Security of Some Proxy Blind Signature Schemes
نویسندگان
چکیده
A proxy blind signature scheme is a digital signature scheme which combines the properties of proxy signature and blind signature schemes. Recently, Tan et al. proposed two proxy blind signature schemes based on DLP and ECDLP respectively. Later, compared with Tan et al.’s scheme, Lal and Awasthi further proposed a more efficient proxy blind signature scheme. In this paper, we show that Tan et al.’s schemes do not satisfy the unforgeability and unlinkability properties. Moreover, we also point out that Lal and Awasthi’s scheme does not possess the unlinkability property either.
منابع مشابه
Double voter perceptible blind signature based electronic voting protocol
Mu et al. have proposed an electronic voting protocol and claimed that it protects anonymity of voters, detects double voting and authenticates eligible voters. It has been shown that it does not protect voter's privacy and prevent double voting. After that, several schemes have been presented to fulfill these properties. However, many of them suffer from the same weaknesses. In this p...
متن کاملAn Enhanced Proxy Blind Signature with two Intractable Problems
A proxy blind signature scheme is combination of two signature schemes particularly proxy signature and blind signature. In this signature scheme the original signer delegate his/her signing authority to some other entity named proxy signer. The proxy signer signs the documents or messages, but he cannot be able to find any link between the blind signature and the identity of the signature requ...
متن کاملOriginal Signer's Forgery Attacks on Discrete Logarithm Based Proxy Signature Schemes
A proxy signature scheme enables a proxy signer to sign messages on behalf of the original signer. In this paper, we demonstrate that a number of discrete logarithm based proxy signature schemes are vulnerable to an original signer’s forgery attack. In this attack, a malicious original signer can impersonate a proxy signer and produce a forged proxy signature on a message. A third party will in...
متن کاملSome Proxy Signature and Designated verifier Signature Schemes over Braid Groups
Braids groups provide an alternative to number theoretic public cryptography and can be implemented quite efficiently. The paper proposes five signature schemes: Proxy Signature, Designated Verifier, Bi-Designated Verifier, Designated Verifier Proxy Signature And Bi-Designated Verifier Proxy Signature scheme based on braid groups. We also discuss the security aspects of each of the proposed sch...
متن کاملDigital Proxy Blind Signature Schemes Based on DLP and ECDLP
In a proxy signature scheme, a potential signer delegates his signing power to a proxy, who signs a message on behalf of the original signer. In a blind signature scheme, the signee cannot link the relationship between the blind message and the signature of the chosen message. That is, the signee cannot make a linkage between the blind signature and the identity of the requester. Therefore, it ...
متن کامل