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Achieving confidentiality and authentication in e-commerce transactions are among the primary security goals. In this paper, a new cryptographic scheme is proposed which guarantees the authenticity of the customer and ensures the confidentiality of the communications among the bank, the merchant and the customer. The proposed solution is the use of a tripartite signcryption scheme with low computational and communications overhead. A variant of the proposed scheme that enables a firewall to authenticate the origin of the ciphertext without disclosure of the contents of the original plaintext message is also presented.
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