Secure asynchronous two-party communication applies ratcheting to strengthen privacy, in the presence of internal state exposures. Security with ratcheting is provided in two forms: forward security and post-compromise security. There have been several such secure protocols proposed in the last few years. However, they come with a high cost.<\/p>\n
In this paper, we propose two generic constructions with favorable properties. Concretely, our first construction achieves\u00a0security awareness<\/i>. It allows users to detect non-persistent active attacks, to determine which messages are not safe given a potential leakage pattern, and to acknowledge for deliveries.<\/p>\n
In our second construction, we define a hybrid system formed by combining two protocols: typically, a weakly secure \u201clight\u201d protocol and a strongly secure \u201cheavy” protocol. The design goals of our hybrid construction are, first, to let the sender decide which one to use in order to obtain an efficient protocol with\u00a0ratchet on demand<\/i>; and second, to restore the communication between honest participants in the case of a message loss or an active attack.<\/p>\n
We can apply our generic constructions to\u00a0any<\/i>\u00a0existing protocol.<\/p>\n","protected":false},"excerpt":{"rendered":"
Secure asynchronous two-party communication applies ratcheting to strengthen privacy, in the presence of internal state exposures. Security with ratcheting is provided in two forms: forward security and post-compromise security. There have been several such secure protocols proposed in the last few years. However, they come with a high cost. In this paper, we propose two 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