I have come up with (and implemented) a version of triple DES for true paranoids, which I call dispersed DES. All I do is append four bytes to the beginning of the output files for each cycle of triple DES. It seems like this should provide even more security than triple DES, but I am no expert. Any comments? Please include "dct@newt.cs.byu.edu" in your replies, as I am unable to maintain access to the mailing list because of volume. Thanks. David C. Taylor dct@newt.cs.byu.edu