An Efficient ID-based Proxy Signcryption Scheme without Bilinear Pairings

Abstract

Signcryption is a cryptographic primitive which simultaneously provides both confidentiality and authenticity in a single logical step. Signcryption based on elliptic curves provides the same level of security using smaller keys compared to schemes based on the discrete logarithm problem over finite fields. Identity-based cryptography serves as an efficient alternative to the traditional certificate-based cryptosystems. The idea of identity-based cryptography is to enable a user to use any arbitrary string that uniquely identifies him as his public key. In a proxy signcryption scheme, an original signer delegates his signing power to a proxy agent, who signcrypts a message on behalf of him. This paper introduces a new identity based proxy signcryption scheme without bilinear pairings. Its security is based on the Elliptic Curve Discrete Logarithm Problem (ECDLP) with a reduced computational complexity compared to other schemes in literature. In this proposed scheme, the receiver is the only one who can verify the origin of the ciphertext. Moreover, in this scheme, an authorized proxy signcrypter can create valid proxy signatures after verifying the identity of the original signcrypter. The proposed scheme achieves the various desirable security requirements. General TermsCryptography, Security.

An Improved Authentication Protocol for Mobile Communication based on Tripartite Signcryption

“…In this paper, a new communication protocol used in GSM using tripartite signcryption scheme without using bilinear pairings that proposed in [13]. The proposed scheme is used to reduce the signaling overhead in the authentication step in mobile communication systems and combats the denial of service attack.…”

“…In this section, the four modules of the tripartite signcryption scheme in [13]. This scheme used to reduce the signaling over head in the authentication protocol in GSM.…”