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Finite blocklength wiretap polar codes: construction and performance

In the present work, we investigate the construction and performances of practical wiretap polar codes which aim at transmitting a message reliably to a legitimate receiver (Bob) while keeping it concealed from an eavesdropper (Eve). We show that, unlike in the asymptotic scenario for which the proof of optimality of wiretap polar codes was derived, the construction of such codes for moderate blocklengths calls for a careful choice of some key design parameters, along with more rigorous formulae for the polarization steps.