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Journal Article
O2TR: Offline OTR Messaging System under Network Disruption
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- Authors
- Mahdi Daghmehchi Firoozjaei, MinChang Kim, JaeSeung Song, Hyoungshick Kim
- Issue Date
- 2019-05
- Citation
- Computers & Security, v.82, pp.227-240
- ISSN
- 0167-4048
- Publisher
- Elsevier Advanced Technology
- Language
- English
- Type
- Journal Article
- Abstract
- Providing a secure and efficient communication system under network disruption without a trusted third party remains a challenging issue. To develop a secure and efficient system in such situations, we extend the conventional Off-The-Record (OTR) protocol into a new protocol named offline OTR (O 2 TR). O 2 TR provides end-to-end security between users without requiring the assumption that they are persistently connected to each other. To show the feasibility of the proposed protocol, we implemented a prototype to support O 2 TR based on the Gajim XMMP instant messaging platform. Our experiments showed that O 2 TR can be used reliably even when the corresponding network party is temporarily broken down. Moreover, O 2 TR provides an efficient way to resume private sessions which is about 34% faster than the original OTR. We also proved the secrecy of O 2 TR using an automated verification tool called AVISPA.
- KSP Keywords
- Broken down, Communication system, End to End(E2E), O 2, Trusted Third Party, Verification Tool, automated verification, efficient communication, end-to-end security, instant messaging(IM)