Abstract
Generalized signcryption can adaptively work as an encryption scheme, a signature scheme, or a signcryption scheme with only one algorithm. The paper proposes an efficient certificateless generic signcryption scheme without utilizing bilinear pairing operations. It is proved to satisfy confidentiality and unforgeability against chosen ciphertext and message attacks in an adaptive manner, respectively, in the random oracle model. Due to the lower computational cost and communication overhead, the proposed scheme is suitable for low power and processor devices.
Highlights
In the traditional Public Key Infrastructure (PKI), a certificate authority (CA) which is a third party issues the certificates to bind the identity of a user and the corresponding public key
A trusted third party named private key generator (PKG) computes private keys from a master secret and users’ identity information and distributes these private keys to users participating in the scheme
An inherent problem of ID-based cryptosystems is the key escrow; that is, the PKG knows the user’s private key, resulting in no user privacy and authenticity. To eliminate these problems simultaneously, Al-Riyami and Paterson introduced the concept of certificateless public key cryptography (CL-PKC) in 2003 [2]
Summary
In the traditional Public Key Infrastructure (PKI), a certificate authority (CA) which is a third party issues the certificates to bind the identity of a user and the corresponding public key. A trusted third party named private key generator (PKG) computes private keys from a master secret and users’ identity information and distributes these private keys to users participating in the scheme This eliminates the need for certificates as used in a traditional PKI. Zhou et al [27] introduced the key-insulated mechanism into GSC and propose a concrete scheme without bilinear pairings in the certificateless cryptosystem setting. We give a formal definition and the security concept of CLGSC and propose an efficient concrete scheme without utilizing bilinear pairing operations based on a certificateless signcryption-tag key encapsulation mechanism [28].
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