In this paper, on the basis of Wu et al.'s strong proxy signature scheme, we propose a strong proxy bind signature scheme based on RSA with which a proxy user is able to make proxy blind signature and verifier may verify it very similar to proxy signature schemes. The proposed scheme is proved to has the security properties of strong unforgeability, strong blindness, Non-repudiation etc. Furthermore, it is no demand to have a secure channel in proxy phase. Thus, it can be said that the proposed scheme is secure and practical.
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