Pairwise Channels Sample Clauses

Pairwise Channels. ‌ One approach to group communication, implemented for example by Signal, is to use a complete network of pairwise channels. That is, each pair of parties is connected by a (reasonably) secure channel, which provides forward secrecy and post compromise security. To send a message to the group, Xxxxx sends it to each participant separately. While this does not exactly match the CGKA abstraction, we argue that similar approaches (e.g. to commit, Xxxxx sends a fresh group key to each other party) do not yield optimal security, even if the pairwise channels are optimally secure [29, 36]. The reason is that when Xxxxx sends a message to every other participant, then this cannot affect the channel between, say, Bob and Xxxxxxx (for this, we would need an action from Bob or Xxxxxxx). So, an adversary executing the following sequence of actions breaks optimal security.
Sample 1
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