Cryptanalysis and improvement of a ECDLP based proxy blind signature scheme

The proxy blind signature scheme (PBSS), allows the authorized proxy signer to use his proxy private key to create a legal blind signature on behalf of original signer. Recently, Alghazzawi, Salim and Hasan (A-S-H), presented the elliptic curve cryptography (ECC) based PBSS. However, we found their scheme is vulnerable to a linkability attack, which shows that there was lacked of unlinkability. In this paper, the improvements are being done in this regards in such a manner that the proposed signature scheme satisfies all the security properties, including unlinkability property. The security of the proposed PBSS rely on the elliptic curve discrete logarithm problem (ECDLP). The signature scheme presented can be implemented in low power and small processor device such as smart card.