how to use /dev/random with base64 encoding

   $  cat /dev/random > myrand05x

        [ Now move mouse at
         random 2 minutes ].

        [ Next, press CTRL-C  ].

   $  cat myrand05x | base64

        [ Shows base64 encoding of
           the binary file myrand05x].

   $  cat myrand05x | base64 > Posted

        [ Saves base64 encoding of
           the binary file to file `Posted’ ].