Conference Publication Details
Mandatory Fields
Monaghan D.;Situ G.;Ryle J.;Gopinathan U.;Naughton T.;Sheridan J.
Proceedings of SPIE - The International Society for Optical Engineering
Analysis of double random phase encryption from a key-space perspective
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Optional Fields
Digital image processing Fourier optics Numerical approximation and analysis Optical processing
The main advantage of the double random phase encryption technique is its physical implementation however to allow us to analyse its behaviour we perform the encryption/decryption numerically. A typically strong encryption scheme will have an extremely large key-space, which will make the probable success of any brute force attack on that algorithm miniscule. Traditionally, designers of optical image encryption systems only demonstrate how a small number of arbitrary keys cannot decrypt a chosen encrypted image in their system. We analyse this algorithm from a key-space perspective. The key-space of an encryption algorithm can be defined as the set of possible keys that can be used to encode data using that algorithm. For a range of problem instances we plot the distribution of decryption errors in the key-space indicating the lack of feasibility of a simple brute force attack.
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