STOC '98 Proceedings of the thirtieth annual ACM symposium on Theory of computing
Off-the-record communication, or, why not to use PGP
Proceedings of the 2004 ACM workshop on Privacy in the electronic society
The dual receiver cryptosystem and its applications
Proceedings of the 11th ACM conference on Computer and communications security
Secure off-the-record messaging
Proceedings of the 2005 ACM workshop on Privacy in the electronic society
Scalable Protocols for Authenticated Group Key Exchange
Journal of Cryptology
Composability and On-Line Deniability of Authentication
TCC '09 Proceedings of the 6th Theory of Cryptography Conference on Theory of Cryptography
Multi-party off-the-record messaging
Proceedings of the 16th ACM conference on Computer and communications security
A secure and scalable Group Key Exchange system
Information Processing Letters
VIETCRYPT'06 Proceedings of the First international conference on Cryptology in Vietnam
HMQV: a high-performance secure diffie-hellman protocol
CRYPTO'05 Proceedings of the 25th annual international conference on Advances in Cryptology
A protocol for secure public instant messaging
FC'06 Proceedings of the 10th international conference on Financial Cryptography and Data Security
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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.