Cryptology ePrint Archive: Report 2010/346

Efficient Generalized Signcryption Schemes

Prashant Kushwah and Sunder Lal

Abstract: Generalized signcryption is a new cryptographic primitive which works as a signcryption scheme, a signature scheme and an encryption scheme as per need. Recently Ji et al. proposed a security model for certificateless generalized signcryption scheme and also proposed a scheme which they claim is secure under the proposed security model. In this paper we show that Ji et al. scheme is not existentially unforgeable against Type-I adversary and propose a simplified certificateless generalized signcryption. We also present an efficient identity based generalized signcryption scheme.

Category / Keywords: public-key cryptography / signcryption, generalized signcryption, identity based cryptography, certificateless cryptography

Date: received 16 Jun 2010

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

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Version: 20100618:183618 (All versions of this report)

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