Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Optical Secret Key Sharing Method Based on Diffie-Hellman Key Exchange Algorithm

  • Jeon, Seok Hee (Department of Electronic Engineering, Incheon National University) ;
  • Gil, Sang Keun (Department of Electronic Engineering, The University of Suwon)
  • Received : 2014.07.14
  • Accepted : 2014.09.12
  • Published : 2014.10.25
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Abstract

In this paper, we propose a new optical secret key sharing method based on the Diffie-Hellman key exchange protocol required in cipher system. The proposed method is optically implemented by using a free-space interconnected optical logic gate technique in order to process XOR logic operations in parallel. Also, we present a compact type of optical module which can perform the modified Diffie-Hellman key exchange for a cryptographic system. Schematically, the proposed optical configuration has an advantage of producing an open public key and a shared secret key simultaneously. Another advantage is that our proposed key exchange system uses a similarity to double key encryption techniques to enhance security strength. This can provide a higher security cryptosystem than the conventional Diffie-Hellman key exchange protocol due to the complexity of the shared secret key. Results of numerical simulation are presented to verify the proposed method and show the effectiveness in the modified Diffie-Hellman key exchange system.

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