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We consider a double random phase encoding Encryption/Decryption system in which the image\udencryption/decryption process is performed numerically. In this paper we look at the effect of quantisation in the\uddecryption process due to the discrete values which a spatial light modulator can display. We look at the\udcharacterisation of a transmissive spatial light modulator and we present results from simulations of the system

Numerical analysis of systematic errors in an optical encryption system