Improved group off-the-record messaging

Hong Liu, Eugene Y. Vasserman, Nicholas Hopper

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

Off-the-Record Messaging (OTR) is an online analogy of face-to-face private chat - messages are confidential and authenticated at the time of the conversation, but cannot later be used to prove authorship. The original OTR protocol is limited to two parties, and is extended by multi-party OTR (mpOTR) to the group chat setting. In doing this, mpOTR unintentionally weakens the security properties provided by its two-party predecessor. We propose an improved group OTR (GOTR)protocol that provides unconditional repudiability, and show how to obtain data origin authentication given this level of repudiability. GOTR resists network failure, colluding and independent malicious insiders, and provides efficient and flexible membership management. We analyze the security properties and performance of GOTR, and present measurement results of a proof-of-concept implementation of GOTR.

Original languageEnglish (US)
Title of host publicationWPES 2013 - Proceedings of the 2013 ACM Workshop on Privacy in the Electronic Society, Co-located with CCS 2013
Pages249-254
Number of pages6
DOIs
StatePublished - Dec 9 2013
Event1st ACM Workshop on Language Support for Privacy-Enhancing Technologies, PETShop 2013 - Co-located with the 20th ACM Conference on Computer and Communications Security, CCS 2013 - Berlin, Germany
Duration: Nov 4 2013Nov 4 2013

Publication series

NameProceedings of the ACM Conference on Computer and Communications Security
ISSN (Print)1543-7221

Other

Other1st ACM Workshop on Language Support for Privacy-Enhancing Technologies, PETShop 2013 - Co-located with the 20th ACM Conference on Computer and Communications Security, CCS 2013
CountryGermany
CityBerlin
Period11/4/1311/4/13

Keywords

  • authentication
  • group communication
  • privacy
  • repudiability
  • robustness

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