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Lecture notes in computer science

An Optimistic Non-repudiation Protocol with Transparent Trusted Third Party

Olivier Markowitch, Steve Kremer

Published Jan 1, 2001• 59 citations
Publisher
DOI
10.1007/3-540-45439-x_25

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An Optimistic Non-repudiation Protocol Focused on Transparent Trusted Third Party

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Non-repudiation service is widely employed in information exchange and online transaction. It requires that its participants are unable to deny their involvement in specific protocol. At the same time, the service should keep fairness, which means that no one could take any advantages over the other one. Researchers have introduced a trusted third party (TTP) to realize these demands. Protocols are grouped into several categories according to the degree of TTP's involvement in protocols. Optimistic non-repudiation protocol is the most important method undoubtedly owe to its lower TTP's involvement. There are two questions. One is that whether it is possible to further decrease TTP's involvement or not. A computable optimistic non-repudiation protocol seems to be a good improvement. This is also our paper's basic protocol. The other question is about whether two types of finally evidences that produced by participants (here is Alice and Bob, and we denote this type evidences as the first type evidences) and TTP (or with the help of TTP, and we demote this type evidences as the second type evidences) are identical. If both types of evidences are not exactly the same, then it shows that TTP has taken part in process of protocol. Thus, it is certain that either participants behaved dishonest, or network went wrong. Participants' prestige will be negatively affected more or less. On the contrary, if two types of evidences are identical, then such feelings will be eliminated. This kind of TTP is called transparent TTP. In this paper, we have accomplished an optimistic non-repudiation protocol with the help of transparent TTP based on a computable non-repudiation protocol.

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Generic non-repudiation protocols supporting transparent off-line TTP

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A non-repudiation protocol enables the fair exchange of an electronic message and an irrefutable digital receipt between two mistrusting parties over the Internet. That is, at the end of any execution instance of such a protocol, either both parties obtain their expected items or neither party does . In this paper, we first argue that it is really meaningful in practice to exploit generic fair non-repudiation protocols with transparent off-line trusted third party (TTP). Namely, in those protocols, each involved party could use any secure digital signature algorithm to produce non-repudiation evidences; and the issued evidences are the same regardless of whether the TTP is involved or not. Then, we present such a fair non-repudiation protocol to overcome some limitations and shortcomings in previous schemes. Technical discussions are provided to show that our protocol is not only secure but also the most efficient solution, compared with existing non-repudiation protocols. In addition, some potential extensions are also pointed out.

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A security protocol for certified e-goods delivery

Aleksandra Nenadić, Ning Zhang, S. Barton

This paper presents an efficient security protocol for certified e-goods delivery with the following features: (1) ensures strong fairness, (2) ensures non-repudiation of origin and non-repudiation of receipt, (3) allows the receiver of an e-goods to verify, during the protocol execution, that the e-goods he is about to receive is the one he is signing the receipt for, (4) does not require the active involvement of a fully trusted third party, but rather an off-line and transparent semi-trusted third party (STTP) only in cases of unfair behaviour by any party, and (5) provides confidentiality protection for the exchanged items from the STTP.

International Conference on Information Technology: Coding and Computing (ITCC)•Jan 1, 2004•16 citations
Non-repudiation service is widely employed in information exchange and online transaction. It requires that its participants are unable to deny their involvement in specific protocol. At the same time, the service should keep fairness, which means that no one could take any advantages over the other one. Researchers have introduced a trusted third party (TTP) to realize these demands. Protocols are grouped into several categories according to the degree of TTP's involvement in protocols. Optimistic non-repudiation protocol is the most important method undoubtedly owe to its lower TTP's involvement. There are two questions. One is that whether it is possible to further decrease TTP's involvement or not. A computable optimistic non-repudiation protocol seems to be a good improvement. This is also our paper's basic protocol. The other question is about whether two types of finally evidences that produced by participants (here is Alice and Bob, and we denote this type evidences as the first type evidences) and TTP (or with the help of TTP, and we demote this type evidences as the second type evidences) are identical. If both types of evidences are not exactly the same, then it shows that TTP has taken part in process of protocol. Thus, it is certain that either participants behaved dishonest, or network went wrong. Participants' prestige will be negatively affected more or less. On the contrary, if two types of evidences are identical, then such feelings will be eliminated. This kind of TTP is called transparent TTP. In this paper, we have accomplished an optimistic non-repudiation protocol with the help of transparent TTP based on a computable non-repudiation protocol.
A non-repudiation protocol enables the fair exchange of an electronic message and an irrefutable digital receipt between two mistrusting parties over the Internet. That is, at the end of any execution instance of such a protocol, either both parties obtain their expected items or neither party does . In this paper, we first argue that it is really meaningful in practice to exploit generic fair non-repudiation protocols with transparent off-line trusted third party (TTP). Namely, in those protocols, each involved party could use any secure digital signature algorithm to produce non-repudiation evidences; and the issued evidences are the same regardless of whether the TTP is involved or not. Then, we present such a fair non-repudiation protocol to overcome some limitations and shortcomings in previous schemes. Technical discussions are provided to show that our protocol is not only secure but also the most efficient solution, compared with existing non-repudiation protocols. In addition, some potential extensions are also pointed out.
This paper presents an efficient security protocol for certified e-goods delivery with the following features: (1) ensures strong fairness, (2) ensures non-repudiation of origin and non-repudiation of receipt, (3) allows the receiver of an e-goods to verify, during the protocol execution, that the e-goods he is about to receive is the one he is signing the receipt for, (4) does not require the active involvement of a fully trusted third party, but rather an off-line and transparent semi-trusted third party (STTP) only in cases of unfair behaviour by any party, and (5) provides confidentiality protection for the exchanged items from the STTP.