Abstract.
We study the problem of maintaining authenticated communication over untrusted communication channels, in a scenario where the communicating parties may be occasionally and repeatedly broken into for transient periods of time. Once a party is broken into, its cryptographic keys are exposed and perhaps modified. Yet, when aided by other parties it should be able to regain its ability to communicate in an authenticated way. We present a mathematical model for this highly adversarial setting, exhibiting salient properties and parameters, and then describe a practically appealing protocol for solving this problem.
A key element in our solution is devising a proactive distributed signature (PDS) scheme in our model. The PDS schemes known in the literature are designed for a model where authenticated communication is available. We therefore show how these schemes can be modified to work in our model, where no such primitives are available a priori. In the process of devising these schemes, we also present a new definition of PDS schemes (and of distributed signature schemes in general). This definition may be of independent interest.
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Received 22 April 1998 and revised 2 April 1999
An extended abstract of this work appeared in the Proceedings of Principles of Distributed Computing, 1997. Part of this research was done while Ran Canetti and Shai Halevi were at the Laboratory of Computer Science in MIT.
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Canetti, R., Halevi, S. & Herzberg, A. Maintaining Authenticated Communication in the Presence of Break-Ins. J. Cryptology 13, 61–105 (2000). https://doi.org/10.1007/s001459910004
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DOI: https://doi.org/10.1007/s001459910004