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Information Theoretic Secret Key Agreement Based on localization

| 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50019 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Aref, Mohammad Reza; Mirmohseni, Mahtab
  7. Abstract:
  8. Sharing secret key is an essential prerequisite of symmetric key cryptography. So, we consider a source model for information theoretic secret key agreement based on the distance among the nodes. Secret key agreement based on information theory, unlike computational models, guarantee full information secrecy, eavesdropper receives no efficient information. The model is a basic system consisting of two legitimate users and an eavesdropper. The legitimate nodes try to agree on a reliable and secure key based on their noisy observation of distance between them. Eavesdropper observes the distance, too. First, we model distance estimation by the nodes to study performance of the system (secret key capacity bounds). We propose two methods to enhance system utility: 1) Artificial Noise Forwarding (ANF), 2) transmission in different beam directions (multi-antenna transmission). In the first method artificial noise is used to worsen eavesdropper’s distance estimation and in the second method beacon signals are sent in different directions and the virtual distances in different beam directions are used as the randomness sources. We show that if eavesdropper is not equipped with multi-directional antenna, then Artificial Noise Forwarding is a useful method while in the case of users equipped with multi-directional antenna, Artificial Noise Forwarding leaks more information to the eavesdropper and transmitting in different directions is a suitable way to increase the secret key rate
  9. Keywords:
  10. Secret Key Agreement ; Localization ; Information Theoretic Security ; Artificial Noise Forwarding ; Transmission in Different Directions

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