ProDOS A2-DES is my version of Paul Guertin's DOS 3.3 A2-DES. It
encrypts and decrypts files in CBC mode. Feel free to send me email and
tell me what you think about ProDOS A2-DES, be it a bug, a suggestion
for improvement, or just a note to say you like it. The Merlin source
code is available on request. ProDOS A2-DES is freeware.

     This particular version of A2-DES (p2.0) is my reworking of the
code to make the encryption algorithm adhere to the Standard. I know it
sounds kind of silly, but that's just how things worked out. Previous
versions processed a lot of the data in reverse order. Now it's right,
but that means A2-DES p2.0 can't read files made by earlier versions. I
suggest you decrypt any old files with the appropriate version, and then
re-encrypt them with the new version. Then throw away all old versions
of the program.


Matthew Fischer
mfischer@heinous.isca.uiowa.edu



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