Paper 2018/1097

End-to-End Secure Mobile Group Messaging with Conversation Integrity and Deniability

Michael Schliep and Nicholas Hopper

Abstract

In this paper, we describe Mobile CoWPI, a deployable, end-to-end secure mobile group messaging application with proofs of security. Mobile CoWPI allows dynamic groups of users to participate in, join, and leave private, authenticated conversations without requiring the participants to be simultaneously online or maintain reliable network connectivity. We identify the limitations of mobile messaging and how they affect conversational integrity and deniability. We define strong models of these security properties, prove that Mobile CoWPI satisfies these properties, and argue that no protocol that satisfies these properties can be more scalable than Mobile CoWPI. We also describe an implementation of Mobile CoWPI and show through experiments that it is suitable for use in real-world messaging conditions.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Preprint.
Keywords
secure messagingmobile messaging
Contact author(s)
schli116 @ umn edu
History
2018-11-15: received
Short URL
https://ia.cr/2018/1097
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2018/1097,
      author = {Michael Schliep and Nicholas Hopper},
      title = {End-to-End Secure Mobile Group Messaging with Conversation Integrity and Deniability},
      howpublished = {Cryptology ePrint Archive, Paper 2018/1097},
      year = {2018},
      note = {\url{https://eprint.iacr.org/2018/1097}},
      url = {https://eprint.iacr.org/2018/1097}
}
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