An identity-based signcryption scheme with public verifiability

Signcryption is a new cryptographic primitive, which can sign and encrypt message at the same time and reduce much communication and computation costs. A new efficient identity-based signcryption scheme was proposed, in which some characteristics of bilinear map were taken into account. In this scheme, anyone can identify the source of the ciphertext, but only the receiver can recover the plaintext. What's more, this scheme can satisfy the confidentiality, unforgeability and nonrepudiation required by signcryption. This scheme is also very efficient regarding the computation costs and the communication overheads after analyzing and being compared with other schemes.