Framing and Realistic Secret Sharing
Framing and Realistic Secret Sharing
The use of Game Theory to Secret Sharing has lead to Rational Secret Sharing (RSS). It claims that from an economic viewpoint it would be irrational for parties to reveal their shares, and so the secret will never be reconstructed! In this presentation we present Realistic Secret Sharing, which we contrast with Rational Secret Sharing (RSS). We do not claim that RSS is wrong, but that it is restricted to a limited number of settings. In the presentation we explain when these settings occur and when not. In the last case we have realistic secret sharing, and the secret will be reconstructed!
In the 2nd part of this talk, we introduce forensics aspects of secret sharing. Suppose that a dealer makes a legal will and distributes shares to family members using Shamir Secret Sharing scheme. Obviously, some of these parties are interested in having a preliminary (i.e., before the death of the dealer), unauthorized, reconstruction of the secret. When the will is released preliminary, one may want to trace who the parties were that illegally reconstructed the secret. Unfortunately such a forensics analysis has no value because the parties releasing the will can frame others.
About the speaker
Distinguished Professor, University of Texas at Dallas
Yvo Desmedt is the Jonsson Distinguished Professor at the University of Texas at Dallas, a Honorary Professor at University College London, a Fellow of the International Association of Cryptologic Research (IACR) and a Member of the Belgium Royal Academy of Science. He received his Ph.D. (1984, Summa cum Laude) from the University of Leuven, Belgium. He held positions at: Universite de Montreal, University of Wisconsin - Milwaukee (founding director of the Center for Cryptography, Computer and Network Security), and Florida State University (Director of the Laboratory of Security and Assurance in Information Technology). He was BT Chair and Chair of Information Communication Technology at University College London. He has held numerous visiting appointments. He is the Editor-in-Chief of IET Information Security and Chair of the Steering Committee of CANS. He was Program Chair of e.g., Crypto 1994, the ACM Workshop on Scientific Aspects of Cyber Terrorism 2002, and ISC 2013. He has authored over 200 refereed papers, primarily on cryptography, computer security, and network security. He has made important predictions, such as his 1983 technical description how cyber could be used to attack control systems (realized by Stuxnet), and his 1996 prediction hackers will target Certifying Authorities (DigiNotar was targeted in 2011). He also authored the first paper on Hardware Trojan (Proc. Crypto 1986) and posed searchable encryption as an open problem in 1993 (NSPW). He was requested to give feedback on: the report by the US Presidential Commission on Critical Infrastructures Protection, the list of Top 10 Scientific Issues Concerning Development of Human Society (China), and gave feedback on some US NIST standards. He suggested that NIST makes a Threshold Cryptography standard.
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