Usable everlasting encryption using the pornography infrastructure

Enka Blanchard (1) , Siargey Kachanovich (2)

1 LORIA - ALGO - Department of Algorithms, Computation, Image and Geometry
2 Corpy&co. Inc

Nine years before Snapchat and its ephemeral messages, Aumann, Ding, and Rabin introduced the idea of everlasting security: an encryption that could not be decrypted after a certain date, no matter the adversary's computing power. Their method is efficient but not adapted to real-life constraints and cannot effectively be used today. This paper looks at what potential entropy sources are available today and proposes a new solution that makes use of the already existing communications from pornography distribution networks. The method proposed has multiple advantages stemming from the fact that pornography is shameful in most societies, giving the agents plausible deniability. It is also usable off-the-shelf by individuals with limited technical skills, although it still requires some effort.

Mots clés: Random beacon; Usable security; Bounded memory model; One-time pad; Index Terms-Usable security

Domaines: Cryptographie et sécurité [cs.CR]; Interface homme-machine [cs.HC]

Enka Blanchard, Siargey Kachanovich. Usable everlasting encryption using the pornography infrastructure. 2019. ⟨hal-02556366v2⟩