The Sender-Excited Secret Key Agreement Model: Capacity, Reliability, and Secrecy Exponents

New Bounds in Secret-Key Agreement: The Gap between Formation and Secrecy Extraction

Perfectly secret message transmission can be realized with only partially secret and weakly correlated information shared by the parties as soon as this information allows for the extraction of informationtheoretically secret bits. The best known upper bound on the rate S at which such key bits can be generated has been the intrinsic information of the distribution modeling the parties’, includ...

Information-Theoretic Secret Key Agreement

Key Generation Using an External Source of Excitation: Capacity, Reliability, and Secrecy Exponent

We study the fundamental limits to secret key generation from an excited distributed source (EDS). In an EDS a pair of terminals observe dependent sources of randomness excited by a pre-arranged signal. We first determine the secret key capacity for such systems with one-way public messaging. We then characterize a tradeoff between the secret key rate and exponential bounds on the probability o...

Secrecy via sources and channels - A secret key - Secret message rate tradeoff region

Alice and Bob want to share a secret key and to communicate an independent message, both of which they desire to be kept secret from an eavesdropper Eve. We study this problem of secret communication and secret key generation when two resources are available – correlated sources at Alice, Bob, and Eve, and a noisy broadcast channel from Alice to Bob and Eve which is independent of the sources. ...

Information Reconciliation Using Reliability in Secret Key Agreement Scheme with ESPAR Antenna

As a countermeasure for eavesdroppers in wireless communications, a secret key agreement scheme using a variable directional antenna called ESPAR antenna was developed. In this scheme, the process of information reconciliation is necessary to correct the discrepancies between the legitimate users’ keys. In this paper, we propose a new information reconciliation protocol using the reliability of...