| Summary: | 博士 === 淡江大學 === 資訊工程學系博士班 === 98 === With the widespread use of public Internet, the problem of secure electronic transaction becomes more and more important issues especially for electronic commerce (e-commerce) environment. Communication via electronic mail (e-mail) becomes a convenience service instead of traditional manuscript letter in e-commerce. For non-repudiation of origin, people append his/her digital signature such as well-known RSA signature to the email. However, the evidence of receipt still relies on the willingness of the recipient in the traditional e-mail service. Hence, the recipient has no responsible for the received e-mail. This dissertation proposes an efficient RSA-based fair certified e-mail delivery protocol. The proposed fair certified e-mail delivery protocol allows the e-mail sender to obtain the irrefutable receipt if the recipient indeed received this e-mail message. The proposed fair certified e-mail delivery protocol supports the pre-computation function in sending the other mails to the same recipient to improve the performance of subsequence communication. As the evaluations of computational cost and communication overhead, the proposed fair certified e-mail delivery protocol is efficient and cost-effective than other relevant protocols.
Transaction privacy has attracted a lot of attention in e-commerce. This dissertation proposes an efficient and provable fair document exchange protocol with transaction privacy. By the proposed protocol, any mutual untrustworthy parties can fairly exchange their valuable document without any assistance from on-line trusted third parties. Moreover, a notary only notarizes each document once. The authorized owner can then exchange the notarized document with different participant repeatedly without disclosing the confidentiality of the document or the identities of 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/backward secrecy, transaction privacy and authorized exchange. In addition, the proposed fair document exchange protocol is more efficient than the other works.
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