The Sender-Excited Secret Key Agreement Model: Capacity, Reliability and Secrecy Exponents
The authors consider the fundamental limits of the secret key generation problem when the sources are randomly excited by the sender and there is a noiseless public discussion channel. In many practical communication settings, the sources or channels may be influenced by some parties involved. Similar to recent works on probing capacity and channels with action-dependent states, their system model captures such a scenario. They derive single-letter expressions for the secret key capacity. Their coding strategy involves a key generation scheme and wiretap channel coding. They show that the secret key capacity is composed of both source- and channel-type randomness.