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Cryptanalysis and Improved of an Efficient Partially Blind Signature Scheme

NONG Qiang,HAO Yan-hua,HUANG Ru-fen(Department of Computer Science and Engineering,Zhangzhou Normal University,Zhangzhou 363000,China)  
An ID-based partially blind signature scheme based on bilinear pairings of elliptic curve proposed recently is cryptanalyzed.It is shown that the scheme is insecure and can not satisfy the blindness property.The signer can link a signature to the corresponding message of signing protocol so that he can track the message holder,and then an attack is put forward.An improved scheme is presented to overcome the above defect.Analysis indicates that the improved scheme is secure against the signer's malicious tracking.
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