This directory contains applications with random numbers and the source code:

exor - for exclusive oring of 2 files = One Time Pad (OTP) = Vernam encryption

lotto2 - for producing Lotto numbers which are really equally distributed

rmm - Shell skript for secure and relative fast delete by first overwriting
      the file with random numbers and than removing.

directory examples - look into  the source code

For details you can use the online help (only option -h)  and look into the
sorce code.