measure the speed of des and aes (rijndael) encryption on the same datafile. using any des and aes library you can find. speed is measured in bytes per second encrypted. find a large file to encrypt (e.g., a 15 mb file, text or binary), read from stdin and written to stdout or a file. if you use stdout, redirect it to a file so the console write does not skew the results. be sure to report which library you used, the os, the machine type and cpu speed. use the os timer mechanism to timestamp the start and end time. execution times below a second are unreliable, so you will need to use a large file.