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Taking biological features and ID as identification,combining biological features Authentication and Signcryption Strategy together,then we can carry out a Secure Signcryption Strategy based on the public key.It utilize the Bilinear pairings property of elliptic curve in finite field,ensuring both of the transaction must join it personally,also encryption and signature are achieved by the lower cost and the safer method,so that it is applicable to a large-scale e-commerce transactions.