A New Identity-based Authenticated Encryption Scheme

Identity-based cryptography is a public key system in which the public key of a user is some unique information about the identity of the user, rather than the traditional public key infrastructure takes certificate authenticates as the public key. It can simplify the manager of the system, and also it can send encrypted messages to users without certificate authenticates.In the hybrid cryptography, the message are encrypted by the public key, since the public key cryptography solved the issuing of the keys, and the system are impressed very little, for the secret key, the time and cost is very low.The traditional symmetric encryption is integrated into identity-based cryptographic systems, a new encryption schemes, a new identity-based authenticated encryption scheme based on the computational Diffie-Hellman assumption is presented. It includes setup, key generation, encryption and decryption with message authentication. Compare to the schemes already existed, our scheme with lower time complexities and communication costs is simple and efficient.This scheme can apply into the real application, such as email or personal communication system. It is as good as the existed public key cryptography and has a well future.Last, a prototype system of this scheme is implemented by the very popular object-oriented software development tool Visual C++ 6.0.