Abstract
Proxy signature is a special digital signature which enables a proxy signer to sign messages on behalf of the original signer. This paper proposes a strongly secure proxy signature scheme and a secure multi-proxy signature scheme based on elliptic curve cryptosystem. Contrast with universal proxy signature schemes, they are secure against key substitute attack even if there is not a certificate authority in the system, and also secure against the original signer’s forgery attack. Furthermore, based on the elliptic curve crypto-system, they are more efficient and have smaller key size than other system. They can be used in electronics transaction and mobile agent environment.
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