Analysis and Improvement of Information Theoretic Secrecy Metrics

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Divband, Ashkan | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 49722 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Aref, Mohammad Reza; Aminzadeh Gohari, Amin
Abstract:
Security in operational cryptography systems is expressed as computational, in the sense that breaking these systems is not possible in polynomial time. Nowadays, advances in computing power of processors and the development of quantum computers, has incresed concerns about the security of cryptographic systems. This is the cause of proposing the information theoretic secrecy in recent decades. In information theoretic secrecy topics, recovering data at target receiver side with zero error should be acomplished along side with defining security criterias. Information leakage is one of the most common security measures. there are another security measures such as rate-distortion, maximal correlation and maximal leakage. In all these criteria, the security value of all symbols in original message for sender is identical. In this thesis, we define a new secrecy measure with unequal secrecy cost, and obtain regional capacity based on this criteria
Keywords:
Wiretap Channel ; Information Theoretic Security ; Unequal Loss Protection ; Leakage Rate