Κωδικοποίηση διαύλου για την αποφυγή υποκλοπώνΚωδικοποίηση διαύλου για την αποφυγή υποκλοπώνCoding for the wiretap channel Διπλωματική Εργασία Diploma Work 2015-01-132015enIn this work we consider the problem of achieving information-theoretic security with practical coding complexity. Specifically, we consider a transmitter, a receiver, and an eavesdropper where the communication channels between the transmitter and the receiver and between the transmitter and the eavesdropper are both binary erasure channels. The objective is the development of a practical coding scheme that attains maximum transmission rate between the transmitter and the receiver and, simultaneously, complete protection of the transmitted data from the eavesdropper. We utilize polar codes which are known to achieve the capacity of any symmetric binary-input discrete memoryless channel. We focus on the binary erasure channel and present the pertinent polar encoding and decoding algorithms. Finally, we show how polar coding can be used for the wire-tap binary erasure channel, achieving maximum transmission rate and complete protection. http://creativecommons.org/licenses/by/4.0/Πολυτεχνείο Κρήτης::Σχολή Ηλεκτρονικών Μηχανικών και Μηχανικών ΥπολογιστώνKosta_Antzela_Dip_2015.pdfChania [Greece]Library of TUC2015-01-13application/binary2.2 MBfree Kosta Antzela Κωστα Αντζελα Karystinos Georgios Καρυστινος Γεωργιος Liavas Athanasios Λιαβας Αθανασιος Bletsas Aggelos Μπλετσας Αγγελος Technical University of Crete Πολυτεχνείο Κρήτης Data encoding (Computer science) Encryption of data (Computer science) data encryption computer science data encoding computer science encryption of data computer science Κωδικοποίηση καναλιού Communication systems, Wireless Wireless data communication systems Wireless information networks Wireless telecommunication systems wireless communication systems communication systems wireless wireless data communication systems wireless information networks wireless telecommunication systems Computer privacy Computer system security Computer systems--Security measures Computers--Security measures Electronic digital computers--Security measures Security of computer systems computer security computer privacy computer system security computer systems security measures computers security measures electronic digital computers security measures security of computer systems