An Optimistic Non-Repudiation Protocol with Transparent Trusted Third Party
Olivier Markowitch and Steve Kremer. An Optimistic Non-Repudiation Protocol with Transparent Trusted Third Party. In Proceedings of the 4th International Conference on Information Security (ISC'01), pp. 363–378, Lecture Notes in Computer Science 2200, Springer, Malaga, Spain, October 2001.
Download
Abstract
In this paper we consider a new and efficient optimistic non-repudiation protocol. In a non-repudiation protocol, during which Alice wants to transmit a message to Bob, Alice has to send a non-repudiation of origin evidence to Bob (attesting that Alice is at the origin of the transmitted message), and Bob has to send a non-repudiation of receipt evidence to Alice (attesting Bob's receipt of the message). Classical solutions propose to use a trusted third party to help realizing the exchange without giving any significant advantage to one of the two parties. In an optimistic protocol, the trusted third party intervenes only in case of problems during the communication between Alice and Bob. Classically, in a situation where an error occurs, evidences that have been digitally signed by the TTP are issued. Although these evidences are distinct from those produced by Alice and Bob in a faultless case, they have the same value in case of a dispute. In this paper we propose a protocol where the TTP produces the same evidences that Alice and Bob should have produced in a faultless protocol execution (this prevents, after a succesful protocol execution, to determine whether the TTP was involved or not).
BibTeX
@inproceedings{MarkowitchKremer2001,
abstract = {In this paper we consider a new and efficient
optimistic non-repudiation protocol. In a
non-repudiation protocol, during which Alice wants to
transmit a message to Bob, Alice has to send a
non-repudiation of origin evidence to Bob (attesting
that Alice is at the origin of the transmitted
message), and Bob has to send a non-repudiation of
receipt evidence to Alice (attesting Bob's receipt of
the message). Classical solutions propose to use a
trusted third party to help realizing the exchange
without giving any significant advantage to one of
the two parties. In an optimistic protocol, the
trusted third party intervenes only in case of
problems during the communication between Alice and
Bob. Classically, in a situation where an error
occurs, evidences that have been digitally signed by
the TTP are issued. Although these evidences are
distinct from those produced by Alice and Bob in a
faultless case, they have the same value in case of a
dispute. In this paper we propose a protocol where
the TTP produces the same evidences that Alice and
Bob should have produced in a faultless protocol
execution (this prevents, after a succesful protocol
execution, to determine whether the TTP was involved
or not).},
address = {Malaga, Spain},
author = {Markowitch, Olivier and Kremer, Steve},
booktitle = {{P}roceedings of the 4th {I}nternational {C}onference
on {I}nformation {S}ecurity ({ISC}'01)},
editor = {Davida, George I. and Frankel, Yair},
month = oct,
pages = {363-378},
publisher = {Springer},
series = {Lecture Notes in Computer Science},
title = {An Optimistic Non-Repudiation Protocol with
Transparent Trusted Third Party},
volume = {2200},
year = {2001},
acronym = {{ISC}'01},
nmonth = {10},
url = {http://www.lsv.ens-cachan.fr/Publis/PAPERS/PS/Kremer-isc01.ps},
}