Laser ablation of graphite is studied both theoretically and experimentally. Plasma temperature and electron density in the early phase of expansion into vacuum are measured as a function of distance from the target. The experimental results agree well with the theoretical simulations. The simulation of ablation shows that plasma plume considerably affects the ablation rate.
Based on the RSA algorithm, as the most common industrial standard of data encryption, modifications with projective and affine transformations for encryption of images that allow to strictly allocate outlines are proposed.
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