Unique Information and Secret Key Agreement

Information-Theoretic Secret Key Agreement

Towards Characterizing When Information-Theoretic Secret Key Agreement Is Possible

This paper is concerned with information-theoretically secure secret key agreement in the general scenario where three parties,quence of random bits broadcast by a satellite. We consider the problem of determining for a given distribution PXY Z whether Alice and Bob can in principle, by communicating over an insecure channel accessible to Eve, generate a secret key about which Eve's information...

Secret key agreement by public discussion from common information

The problem of generating a shared secret key S by two parties knowing dependent random variables X and I’, respectively, but not sharing a secret key initially, is considered. An enemy who knows the random variable 2, jointly distributed with X and Y according to some probability distribution PXYZ, can also receive all messages exchanged by the two parties over a public channel. The goal of a ...

Compressed Secret Key Agreement: Maximizing Multivariate Mutual Information per Bit

The multiterminal secret key agreement problem by public discussion is formulated with an additional source compression step where, prior to the public discussion phase, users independently compress their private sources to filter out strongly correlated components in order to generate a common secret key. The objective is to maximize the achievable key rate as a function of the joint entropy o...

Information-Theoretic Secret-Key Agreement: The Asymptotically Tight Relation Between the Secret-Key Rate and the Channel Quality Ratio

Information-theoretically secure secret-key agreement between two parties Alice and Bob is a well-studied problem that is provably impossible in a plain model with public (authenticated) communication, but is known to be possible in a model where the parties also have access to some correlated randomness. One particular type of such correlated randomness is the so-called satellite setting, wher...