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Information Theoretic Security in Broadcast and Multiple Acess Channels

Jahandideh, Vahid | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41685 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Salmasizadeh, Mahmoud
  7. Abstract:
  8. Wireless communication networks such as cell phones are rapidly expanding and every day they attract more users. Information flow in these networks is basically through free space. Thus, theses networks are inherently subjected to eavesdropping. Cryptography based on the secure key is the well known traditional way of protecting information security in wireless networks. However, these cryptosystems are just computationally secure and have their vulnerabilities. Information theoretic security is a relatively new method which doesn’t rely on any preshared key or key infrastructure and uses inherent characteristics of the communication channel to provide robust and provable security.In this thesis, the concept of information theoretic security for broadcast and multiple access channels is reviewed. Some lemmas regarding secure code design are given. Moreover, Secrecy capacity of two receiver broadcast channel for a new scenario is derived in which it is assumed that the legitimate receiver has access to a noisy version of eavesdroppers channel outputs. The secrecy capacity of deterministic multiple access channels is simplified and for the first time, the secrecy capacity of multiple access channel with a wiretapper for a special class is given in the end.

  9. Keywords:
  10. Wiretap Channel ; Information Theory ; Multiple Access Relay Channel (MARC) ; Information Theoretic Security ; Broadcast Channel ; Multiple Access

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