%0 Journal Article
%T Provable Secure Identity Based Signcryption Schemes without Random Oracles
%A Prashant Kushwah
%A Sunder Lal
%J International Journal of Network Security & Its Applications
%D 2012
%I Academy & Industry Research Collaboration Center (AIRCC)
%X Signcryption is a cryptographic primitive which performs encryption and signature in a single logical step with the cost lower than signature-then-encryption approach. Recently, Li et al. [35] proposed the first provable secure identity based signcryption without random oracles. In their scheme sender signs the ciphertext. However, in [11] Boyen showed that non-repudiation is easily achieved if the sender sign the plaintext rather than ciphertext. In this paper we proposed an identity based signcryption scheme without random oracles, which provides the non-repudiation with respect to plaintext. We also proposed anidentity based public verifiable signcryption scheme with third party verification in the standard model.
%K Signcryption
%K identity based cryptography
%K provable security
%K standard model
%K public verifiable signcryption
%U http://airccse.org/journal/nsa/0512nsa06.pdf