NDLI: Distributing trusted third parties

Content Provider	ACM Digital Library
Author	Küpçü, Alptekin
Abstract	Trusted Third Parties (TTPs) are widely employed in various scenarios for providing fairness guarantees (e.g., in fair exchange or e-commerce protocols, including secure two-party computation), for distributing secrets (e.g., in authentication or secret-sharing protocols, as well as group signatures), and for creating trust (e.g., as certificate authorities). Such wide use of TTPs, as well as the trust requirement that is put on them make them a prime target for distributed systems and cryptography research. There are some well-known and proven solutions to the problem of distributing the trust put on TTPs: byzantine agreement or secure multi-party computation techniques can be employed to distribute the job of any TTP to multiple parties, tolerating up to half or one-third of those parties being malicious. Such techniques are not widely-employed in practice possibly due to their quadratic complexity or inter-operation requirements. This brings up the question of distributing TTPs in a much more efficient way, possibly via using autonomous agents, who do not directly communicate with each other. In this paper, we present various known techniques for distributing the trust put on TTPs. Then, we concentrate on using multiple autonomous parties, who do not communicate with each other at all, to realize a single TTP. We discuss the role of synchrony in such attempts, and conclude with some open questions.
Starting Page	92
Ending Page	112
Page Count	21
File Format	PDF
ISSN	01635700
DOI	10.1145/2491533.2491553
Journal	ACM SIGACT News (SIGA)
Volume Number	44
Issue Number	2
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1992-06-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Distributing trust Fair exchange Trusted third party
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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