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Anonymous Whistleblowing over Authenticated Channels

Agrikola, Thomas 1; Couteau, Geoffroy; Maier, Sven 1
1 Institut für Informationssicherheit und Verlässlichkeit (KASTEL), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The goal of anonymous whistleblowing is to publicly disclose a message while at the same time hiding the identity of the sender in a way that even if suspected of being the sender, this cannot be proven. While many solutions to this problem have been proposed over the years, they all require some form of interaction with trusted or non-colluding parties. In this work, we ask whether this is fundamentally inherent. We put forth the notion of anonymous transfer as a primitive allowing to solve this problem without relying on any participating trusted parties.

We initiate the theoretical study of this question, and derive negative and positive results on the existence of such a protocol. We refute the feasibility of asymptotically secure anonymous transfer, where the message will be received with overwhelming probability while at the same time the identity of the sender remains hidden with overwhelming probability. On the other hand, resorting to fine-grained cryptography, we provide a heuristic instantiation (assuming ideal obfuscation) which guarantees that the message will be correctly received with overwhelming probability and the identity of the sender leaks with vanishing probability. ... mehr

DOI: 10.1007/978-3-031-22365-5_24
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Informationssicherheit und Verlässlichkeit (KASTEL)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2022
Sprache Englisch
Identifikator ISBN: 978-3-031-22365-5
ISSN: 0302-9743
KITopen-ID: 1000154152
HGF-Programm 46.23.01 (POF IV, LK 01) Methods for Engineering Secure Systems
Erschienen in Theory of Cryptography – 20th International Conference, TCC 2022, Chicago, IL, USA, November 7–10, 2022, Proceedings, Part II. Ed.: E. Kiltz
Veranstaltung 20th Theory of Cryptography Conference (TCC 2022), Chicago, IL, USA, 07.11.2022 – 10.11.2022
Verlag Springer Nature Switzerland
Seiten 685–714
Serie Lecture Notes in Computer Science (LNCS) ; 13748
Vorab online veröffentlicht am 21.12.2022
Nachgewiesen in Scopus
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