Comment on "Optical image encryption with Hartley transforms".
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We numerically demonstrate that the image encryption algorithm with intensity random filtering in the Hartley domain proposed in a recent Letter by Chen and Zhao [Opt. Lett.31, 3438 (2006)] has the problem of low security. Original image information can be visually revealed only by an inverse Hartley transform without any decryption key.
[1] Linfei Chen,et al. Optical image encryption with Hartley transforms. , 2006, Optics letters.