PROVABLE SECURE IDENTITY BASED SIGNCRYPTION SCHEMES WITHOUT RANDOM ORACLES
Prashant Kushwah1 and Sunder Lal2
1Department of Mathematics and Statistics, Banasthali University, Rajasthan, India
2Vice Chancellor, Veer Bahadur Singh Purvanchal University, Jaunpur (UP), India
ABSTRACT
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 an identity based public verifiable signcryption scheme with third party verification in the standard model.
KEYWORDS
Signcryption, identity based cryptography, provable security, standard model, public verifiable signcryption
ORIGINAL SOURCE URL : http://airccse.org/journal/nsa/0512nsa06.pdf
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