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.
Highlights
Parties involved in Internet-based e-commerce usually do not fully trust each other
(2) Non-repudiation of origin (NOO): The sender of the document generates irrefutable origin evidence for the receiver that can be presented to a third party, who can determine if the sender is the authorized owner of a given document
(3) Non-repudiation of receipt (NOR): The designated receiver generates irrefutable receipt evidence for the sender of the document that can be presented to a third party, who can determine if the designated receiver has received a given document
Summary
Parties involved in Internet-based e-commerce usually do not fully trust each other. This mutual distrust is a major motivator for the fair exchange of documents between parties. The offline TTP issues a certified commitment for each document using the public key-based verifiable encryption method [4] This verifiable encryption method ensures that the designated receiver can verify the relationship between the received ciphertext and the expected document before obtaining the real document. The proposed protocol integrates encryption and digital signature by inspiring from the concept of extractable commitment technology It ensures strong fairness, non-repudiation of origin, non-repudiation of receipt, and message confidentiality, and provides the following security functions to enhance the security of fair document exchange:. The offline notary does not need to store any messages or maintain any public catalog after notarizing the documents These features make the proposed protocol practical and cost-effective for multi-receiver e-commerce environments.
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