Circumventing Cryptographic Deniability with Remote Attestation

Lachlan Gunn, Ricardo Vieitez Parra, N. Asokan

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

96 Lataukset (Pure)

Abstrakti

Deniable messaging protocols allow two parties to have ‘off-the-record’ conversations without leaving any record that can convince external verifiers about what either of them said during the conversation. Recent events like the Podesta email dump underscore the importance of deniable messaging to politicians, whistleblowers, dissidents and many others. Consequently, messaging protocols like Signal and OTR are designed with cryptographic mechanisms to ensure deniable communication, irrespective of whether the communications partner is trusted.

Many commodity devices today support hardware assisted remote attestation which can be used to convince a remote verifier of some property locally observed on the device.

We show how an adversary can use remote attestation to undetectably generate a non-repudiable transcript from any deniable protocol (including messaging protocols) providing sender authentication, proving to skeptical verifiers what was said. We describe a concrete implementation of the technique using the Signal messaging protocol. We then show how to design protocols that are deniable even against an adversary capable of attestation, and in particular how attestation itself can be used to restore deniability by thwarting realistic classes
of adversary.
AlkuperäiskieliEnglanti
OtsikkoProceedings on Privacy Enhancing Technologies
Sivut350–369
DOI - pysyväislinkit
TilaJulkaistu - 12 heinäkuuta 2019
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaPRIVACY ENHANCING TECHNOLOGIES SYMPOSIUM - Stockholm, Ruotsi
Kesto: 16 heinäkuuta 201920 heinäkuuta 2019
Konferenssinumero: 19

Julkaisusarja

NimiProceedings on Privacy Enhancing Technologies
KustantajaDe Gruyter
Numero3
Vuosikerta2019
ISSN (elektroninen)2299-0984

Conference

ConferencePRIVACY ENHANCING TECHNOLOGIES SYMPOSIUM
LyhennettäPETS
MaaRuotsi
KaupunkiStockholm
Ajanjakso16/07/201920/07/2019

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