Integration of Signature Encryption and Key Exchange

Signature, encryption and key exchange are some of the most important and foundational cryptographical tool. In most cases, they are all needed to provide different secure functions. There exist called authenticated encryption scheme and signcryption schemes that is the integration of signature and encryption. On the other hand, there are also some proposals on the efficient combination of signature and key exchange. In this paper, we present a protocol that simultaneously realizes all the three functions with a high efficiency and then give a security analysis. The random integer k needed for DH private key is also reused as the encryption key and signature random integer in both entities, which makes our protocol more efficient than current others.