Abstract
Authorization mechanism is introduced to prevent the on-line original signer problem in this scheme. The semi-trusted third party's secret value in the proxy signature strengthens the unforgeability. The proxy signer's common signature is added into the proxy signature which ensures the undeniability. And the time stamp makes it possible to revoke the proxy signer's power. What's more, the scheme needs shorter time to generate proxy signature since it is based on Schnorr signature.
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