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In this paper we provide secrecy metrics applicable to physical-layer codingtechniques with finite blocklengths over Gaussian and fading wiretap channelmodels. Our metrics go beyond some of the known practical secrecy measures,such as bit error rate and security gap, so as to make lower boundprobabilistic guarantees on error rates over short blocklengths both precedingand following a secrecy decoder. Our techniques are especially useful in caseswhere application of traditional information-theoretic security measures iseither impractical or simply not yet understood. The metrics can aid bothpractical system analysis, and practical system design for physical-layersecurity codes. Furthermore, these new measures fill a void in the currentlandscape of practical security measures for physical-layer security coding,and may assist in the wide-scale adoption of physical-layer techniques forsecurity in real-world systems. We also show how the new metrics providetechniques for reducing realistic channel models to simpler discrete memorylesswiretap channel equivalents over which existing secrecy code designs mayachieve information-theoretic security.

Analysis of Short Blocklength Codes for Secrecy