19 February 2018 Application to optical secret key sharing cryptography using phase-shifting digital holography
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We propose a new optical secret key sharing method based on the modified Diffie-Hellman key exchange protocol required in cipher system. The proposed secret key sharing algorithm is optically implemented by 2-step quadrature phase-shifting digital holographic encryption technique using orthogonal polarization. An unknown user’s private key is encrypted into three ciphered digital holograms which are supposed to be opened to the public for secret key sharing. The encrypted digital holograms are Fourier transform holograms and are recorded on CCDs with 256 gray level quantized intensities in the optical setup. The decryption with three ciphered digital holograms reconstructs each user’s private key information, which is used to generate the same shared secret key to each other. The advantage of the proposed method is that the optical setup has a kind of double key encryption scheme and provides the discretion of the user’s private key. The proposed method is very efficient in applying to a secret key sharing cryptosystem with high security strength.
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Sang Keun Gil, Sang Keun Gil, Seok Hee Jeon, Seok Hee Jeon, Jong Rae Jung, Jong Rae Jung, } "Application to optical secret key sharing cryptography using phase-shifting digital holography", Proc. SPIE 10558, Practical Holography XXXII: Displays, Materials, and Applications, 105580W (19 February 2018); doi: 10.1117/12.2289275; https://doi.org/10.1117/12.2289275

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