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Panini - Anonymous Anycast and an Instantiation

Coijanovic, Christoph ORCID iD icon 1; Weis, Christiane; Strufe, Thorsten ORCID iD icon 1
1 Kompetenzzentrum für angewandte Sicherheitstechnologie (KASTEL), Karlsruher Institut für Technologie (KIT)

Abstract:

Anycast messaging (i.e., sending a message to an unspecified receiver) has long been neglected by the anonymous communication community.
An anonymous anycast prevents senders from learning who the receiver of their message is, allowing for greater privacy in areas such as political activism and whistleblowing.
To design protocols with provable guarantees for anonymous anycast, a formal consideration of the problem is necessary, but missing in current work.
We use a game-based approach to provide formal definitions of anycast functionality and privacy.
Our work also introduces Panini, the first anonymous anycast protocol that requires only existing infrastructure.

We show that Panini allows the actual receiver of the anycast message to remain anonymous, even in the presence of an honest but curious sender.
In an empirical evaluation, we find that Panini adds only minimal overhead over regular unicast:
Sending a message anonymously to one of eight possible receivers results in an end-to-end latency of 0.76s.


Zugehörige Institution(en) am KIT Kompetenzzentrum für angewandte Sicherheitstechnologie (KASTEL)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 0302-9743, 1611-3349
KITopen-ID: 1000167101
HGF-Programm 46.23.01 (POF IV, LK 01) Methods for Engineering Secure Systems
Erschienen in 28th European Symposium on Research in Computer Security, The Hague, The Netherlands, September 25-29, 2023
Veranstaltung 28th European Symposium on Research in Computer Security (ESORICS 2023), Den Haag, Niederlande, 25.09.2023 – 29.09.2023
Verlag Springer-Verlag
Serie Lecture notes in computer science ; 1435
Bemerkung zur Veröffentlichung in press
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