The certificate-based cryptosystems is traditional way in providing the system parameters. Identity-based cryptography is more efficient than certificate-based cryptosystems. Each user in identity-based cryptography uses any arbitrary string that uniquely identifies him as his public key. This paper proposes a new identity-based tripartite signcryption scheme based on the elliptic curve discrete logarithm problem. The proposed id-based 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.
This paper introduces a new authentication protocol using the tripartite signcryption scheme without bilinear pairings that provides confidentiality and authentication between three entities. Mobile communication seems very attractive to users as well as operators and service providers. However, despite of its numerous advantages, mobile communication has been facing many security problems. In this paper, it is demonstrated how the proposed tripartite signcryption scheme can be used to provide authentication and to guarantee secure communication. The use of the proposed tripartite signcryption scheme helps reduce the signaling overhead compared to the scheme in [1].
There is an increased activity in research and development conducted to improve current payment systems in parallel with the progress of Internet. Signcryption combines the functionalities of encryption and digital signing in a single logical step. It is a cryptographic primitive that provides confidentiality, integrity, authentication and non-repudiation. Identity-based cryptography serves as an efficient alternative to the traditional certificate-based cryptosystems. This paper introduces an efficient electronic payment system based on signcryption without bilinear pairings. This e-cash system is more efficient than other schemes employing bilinear pairings and involves less computational cost. In the proposed protocol, the token is issued and authenticated by the bank to prevent double spending problem. The customer delegates his signing capability to the merchant. The bank verifies the identities of both the original signer (customer) and the proxy signer (merchant) and ensures the originality of the transaction. Unlike the existing e-payment systems, the problem of double spending of e-cash does not arise because each transaction is made uniquely identifiable. Hence, no separate protocol is needed to check double-spending. The performance and the security analysis of the proposed e-cash system are discussed revealing its strength from the viewpoint of security and efficiency with regard to computations required. General TermsCryptography, Security.
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