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- W3106196234 abstract "We consider the secret key generation problem when sources are randomly excited by the sender and there is a noiseless public discussion channel. Our setting is thus similar to recent works on channels with action-dependent states, where the channel state may be influenced by some of the parties involved. We derive single-letter expressions for the secret key capacity through a type of source emulation analysis. We also derive lower bounds on the achievable reliability and secrecy exponents, i.e., the exponential rates of decay of the probability of decoding error and of the information leakage. These exponents allow us to determine a set of strongly achievable secret key rates. For degraded eavesdroppers, the maximum strongly achievable rate equals the secret key capacity; our exponents can also be specialized to previously known results. In deriving our strong achievability results, we introduce a coding scheme that combines wiretap coding (to excite the channel) and key extraction (to distill keys from residual randomness). The secret key capacity is naturally seen to be a combination of both source- and channel-type randomness. Through examples, we illustrate a fundamental interplay between the portion of the secret key rate due to each type of randomness. We also illustrate inherent tradeoffs between the achievable reliability and secrecy exponents. Our new scheme also naturally accommodates rate limits on the public discussion. We show that under rate constraints, we are able to achieve larger rates than those that can be attained through a pure source emulation strategy." @default.
- W3106196234 created "2020-11-23" @default.
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- W3106196234 date "2015-01-01" @default.
- W3106196234 modified "2023-09-24" @default.
- W3106196234 title "The Sender-Excited Secret Key Agreement Model: Capacity, Reliability, and Secrecy Exponents" @default.
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- W3106196234 doi "https://doi.org/10.1109/tit.2014.2369496" @default.
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