Cryptology ePrint Archive: Report 2011/372

Identity based signcryption schemes without random oracles

Prashant Kushwah and Sunder Lal

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.. In this paper we gave attacks on confidentiality and unforgeability of two identity based signcryption schemes without random oracles. Further we proposed an improved identity based signcryption scheme without random oracles. We also proposed an identity based public verifiable signcryption scheme with third party verification without random oracles.

Category / Keywords: public-key cryptography / Signcryption, public verifiable signcryption, identity based cryptography, provable security, standard model.

Date: received 8 Jul 2011

Contact author: pra ibs at gmail com; sunder_lal2@rediffmail com

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Version: 20110710:030725 (All versions of this report)

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