| Summary: | 碩士 === 東吳大學 === 資訊科學系 === 92 === The proxy signature is that an original signer delegates his or her signing capability to a proxy signer, and then the proxy signer creates a signature on behalf of the original signer. When a receiver verifies a proxy signature, he verifies the signature itself and original signer’s delegation together. A signcryption scheme is a cryptographic primitive which combines both functions of digital signature and a symmetric encryption algorithm in a logical single step, offers authentication and confidentiality properties at the same time, and has more efficient computational cost than the traditional signature-then-encrytion approach. In this thesis, we propose a proxy signcryption scheme that combines the ideas of the proxy signature scheme, the signcryption scheme and the authenticated key agreement protocol. The proposed proxy signcryption scheme has perfect forward secrecy, and may reduce the computational and communication costs.
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