International Journal of Computer Applications |
Foundation of Computer Science (FCS), NY, USA |
Volume 76 - Number 16 |
Year of Publication: 2013 |
Authors: Hassan M. Elkamchouchi, Yasmine Abouelseoud, Eman F. Abu Elkhair |
10.5120/13330-0817 |
Hassan M. Elkamchouchi, Yasmine Abouelseoud, Eman F. Abu Elkhair . An Efficient ID-based Proxy Signcryption Scheme without Bilinear Pairings. International Journal of Computer Applications. 76, 16 ( August 2013), 11-16. DOI=10.5120/13330-0817
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.