Encryption/Decryption for ZIP/UNZIP


I have recently learned that pkzip style encryption is not 
covered in the restrictive US laws regarding the export of
encryption software.  This is due to the simple algorithm
used in pkzip.

Although the pkzip algorithm is much simpler than DES 40
bit encryption (which is also legal to export), I have
found it to be effective to meet normal personal
encryption requirements.

It certainly won't withstand an attack by an experienced 
cryptographer, but typical "hackers" can not break the
encryption in a short amount of time (if you use a 
well-chosen password).  I have not found a "quick
crack" program to break pkzip encryption.  Of course, 
one may come up in the future, but for now this format
is safe.


Send me your e-mail.  What do you think?

 1) Please add pkzip encryption/decryption
 2) Give me the pkzip format, AND a different format
    that is unique to Delphi Zip (less popular
    encryption formats are less likely to be attacked
    by "hackers")
 3) Don't bother with the pkzip format.  Just give
    me a unique format.
 4) Don't bother at all. If I want security, I'll go
    with a much better encryption scheme.


Eric W. Engler
englere@swcp.com