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The notion of certificateless cryptography is aimed to eliminate the use of certificates in traditional public key cryptography and also to solve the key-escrow problem in identity-based cryptography. Many kinds of security models have been designed for certificateless cryptography and many new schemes have been introduced based on the correspondence of the(More)
Signcryption is a new cryptographic primitive which simultaneously provides both confidentiality and authenticity. This paper proposes an improved signcryption scheme and a variant scheme providing message recovery. The first scheme is revised from an authenticated encryption scheme which has been found to have a security-flaw. Our scheme solves the(More)
Keywords: Bilinear pairing Certificateless signature Random oracle Short signature Strongly secure a b s t r a c t Short certificateless signatures have come into limelight in recent years. On the one hand, the property of certificateless eliminates the certificate management problem in traditional PKI and the key-escrow problem in some ID-based signature(More)