This is version 2.5 of the PRO-CRYPT text file encryption package.

Version 2.5 implemented better encryption algorythms, increasing security
as well as producing faster execution times.

As of version 2.0, the entire package has been re-written in C.
This resulted in two, very pleasant benefits:

a)  The executable file sizes were reduced tremendously.

          NCRYPT.EXE      Old - 39,578 bytes
                          New - 10,851 bytes

          DCRYPT.EXE      Old - 39,182 bytes
                          New - 10,833 bytes

b)  The execution time for both modules have improved by 500-1000 percent.
    I ran my initial time testing with a standard text file containing
    18,499 characters in 442 lines, using an AST Premium 286 running at
    10 MHz.  Here are the times I got:

          NCRYPT.EXE      Old - 44.5 seconds
                          New -  4.9 seconds

          DCRYPT.EXE      Old - 49.3 seconds
                          New -  5.3 seconds

(Just a note, for those Basic programmers out there: If you have been looking
for a reason to learn, and use C instead of Basic, here are two perfect 
examples of why you should.)

Obviously, actual execution time depends on a lot of factors, like CPU
type and speed, disk access time, interleave value, etc. 

Tim Sheets (author)