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Yes absolutely. I believe that web cams make excellent true random number generators, but. The camera has to be operated within a visually managed environment. This is necessary to determine and control entropy of the resultant images for quality control purposes. The trick is not to rely on the scene the camera sees, but the image noise. Only God ...


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A simple way to think of the S-boxes of DES when it comes to a hardware implementation is: 8 independent ROM ICs, each with 6 address input lines and 4 data out lines. In an educational physical implementation with retro standard ICs, two such ROMs fit a 4 kiB EPROM (a 2732). Some actual software implementations of DES do group S-boxes two by two in order to ...


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As for "how to build the substitution as hardware", it should be easy if you know any of the hardware description language (eg. VHDL or Verilog). Simply write the Sboxes of DES, then the synthesis software will handle the rest. You can also "synthesis" by hand, although that may take a lot of effect. Still, I'm not sure if this is what you are looking for. ...



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