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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)
In this paper, a certificateless proxy signature scheme is introduced. The advantage of our scheme is that it can be extended into a certificateless proxy blind signature scheme very easily.
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)
—Password-authenticated key exchange (PAKE) protocols are designed to be secure even when the secret key used for authentication is a human-memorable password. In this paper, we consider PAKE protocols in the group scenario, in which a group of clients, each of them shares a password with an " honest but curious " server, intend to establish a common secret… (More)