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The certificatebased cryptosystems is traditional way in providing the system parameters. Identitybased
cryptography is more efficient than certificatebased cryptosystems. Each user in identitybased
cryptography uses any arbitrary string that uniquely identifies him as his public key. This paper proposes
a new identitybased tripartite signcryption scheme based on the elliptic curve discrete logarithm problem.
The proposed idbased tripartite signcryption scheme does not use the bilinear pairings in both the
Signcryption and unsigncryption phases. The proposed scheme used to reduce the communication over
head when three entities wants to communicate securely as in authentication protocol in GSM and in ecommerce.
The proposed scheme satisfies various desirable security properties. Also, the performance of
the proposed scheme is tested.
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