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Signcryption is a relatively new technique in public key cryptography, that perform both the functions of digital signature and encryption in a single step, in a way that is more efficient than signing and encrypting separately. Signcryption scheme can achieve authentication and encryption simultaneously, it successfully prevents mutual cheating in message transmission. In this paper a Signcryption scheme is suggested which is based on Elliptic Curve Cryptography (ECC). Main benefit of the proposed scheme is that it uses only elliptic curve for both encryption and signature generation. Message transmission is in the form of a point P (m) embedded in Elliptic Curve and encrypted by point addition which is efficient and safe.
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