"Trevor Shuttleworth" wrote in message
...
And you can still get password crackers for WinZip

Regards

Trevor



Well, I found a paper where the authors discuss a way to attack the
encryption:
http://www.cse.ucsd.edu/users/tkohno/papers/WinZip/

If Winzip isn't enough, PGP probably is. The point is that the only way to
really protect a workbook is to encrypt the xls file using strong
encryption.

/Fredrik