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In this paper, an efficient and fully secure revocable key policy ABE scheme is proposed. In our scheme, each user is assigned a key according to its attributes and unique identity. A sender can specify the list of revoked users and attributes of the cipher text explicitly. If the users have been revoked, they can not decrypt the message no matter whether their attributes satisfies the access formula...
An aggregate signature scheme allows a public algorithm to aggregate n signatures of n distinct messages from n signers into a single signature. By validating the single resulting signature, one can be convinced that the messages have been endorsed by all the signers. Certificateless aggregate signatures allow the signers to authenticate messages without suffering from the complex certificate management...
Signcryption is a cryptographic primitive that fulfills both the functions of digital signature and public key encryption simultaneously, at a cost significantly lower than that required by the traditional signature-then-encryption approach. In this paper, we propose the first generic construction of identity-based signcryption (GCIS) by using identity-based key encapsulation mechanism (ID-KEM), data...
The idea of threshold cryptography is to distribute secret information and computation among multi parties in order to prevent a single point of failure or abuse. Certificateless public key cryptography(CL-PKC) does not require certificates to guarantee the authority of public keys while avoids the inherent key escrow of identity-based cryptography(IBC). In this paper, we propose a certificateless...
Signcryption is a cryptographic primitive that performs digital signature and public key encryption simultaneously, at lower computational costs and communication overheads than the signature-then-encryption approach. In 2005, Huang et al. proposed an identity-based ring signcryption scheme by combining the concepts of identity-based ring signature and signcryption together. However, their scheme...
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