Cryptography – Key management – Having particular key generator
Patent
1996-04-30
1999-08-17
Cain, David C.
Cryptography
Key management
Having particular key generator
359 7, 359 11, 369102, 380 6, H04K 100
Patent
active
059405147
ABSTRACT:
An encryption method and apparatus for holographic data storage are disclosed. In a system using orthogonal phase-code multiplexing, data is encrypted by modulating the reference beam using an encryption key K represented by a unitary operator. In practice, the encryption key K corresponds to a diffuser or other phase-modulating element placed in the reference beam path, or to shuffling the correspondence between the codes of an orthogonal phase function and the corresponding pixels of a phase spatial light modulator. Because of the lack of Bragg selectivity in the vertical direction, the phase functions used for phase-code multiplexing are preferably one dimensional. Such phase functions can be one-dimensional Walsh functions. The encryption method preserves the orthogonality of reference beams, and thus does not lead to a degradation in crosstalk performance.
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Bashaw Matthew C.
Heanue John F.
Hesselink Lambertus
Cain David C.
The Board of Trustees of the Leland Stanford Junior University
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