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This paper presents two types of digital signature schemes combinely that are blind signature and proxy signature. In the proxy blind signature scheme, a signer other than the original signer signs the document as the agent of the original signer not knowing the meaning of the message. In this paper, an enhanced proxy blind signature is proposed, in which a time stamp approach is added to the proxy blind signature scheme which is based upon the Discrete Logarithm Problem (DLP).
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