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Abstract:Transaction privacy has attracted a lot of attention in the e-commerce. This study proposes an efficient and provable fair document exchange protocol with transaction privacy. Using the proposed protocol, any untrusted parties can fairly exchange documents without the assistance of online, trusted third parties. Moreover, a notary only notarizes each document once. The authorized document owner can exchange a notarized document with different parties repeatedly without disclosing the origin of the document or the identities of transaction participants. Security and performance analyses indicate that the proposed protocol not only provides strong fairness, non-repudiation of origin, non-repudiation of receipt, and message confidentiality, but also enhances forward secrecy, transaction privacy, and authorized exchange. The proposed protocol is more efficient than other works.

This paper proposes an efficient authentication key exchange protocol. The authentication key exchange is an important issue in information security and network security. It assures two parties to generate shared keys secretly.Many information security and network security techniques provide security based on this shared secret key. The proposed scheme generates multiple shared keys for two parties at a time. It does not only withstand general attacks, also provides perfect forward secrecy. By making comparisons with other method, it takes less computation time.