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- W2086315534 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." @default.
- W2086315534 created "2016-06-24" @default.
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- W2086315534 date "2000-01-01" @default.
- W2086315534 modified "2023-10-16" @default.
- W2086315534 title "Maintaining Authenticated Communication in the Presence of Break-Ins" @default.
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- W2086315534 doi "https://doi.org/10.1007/s001459910004" @default.
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