Nicholas,
over the years many have made similar remarks (including Peter Gutmann), so far I havent seen any proof of anyone cracking it.... anyway - that standard encryption is always been regarded as basic. Check out the web site www.pkware.com, click on products then select "Professional Editon with secure desktop". At $100 US, its cheap.... I just have to call the command-line version. It also saves me writing a decryptor at the other end.
The pro version does have strong encryption, yes. The same encryption you can get for free in various crypto libs as it happens. The standard version's encryption isn't very strong, and can be cracked in a matter of minutes with a known-plaintext attack. Brute force takes a bit longer, of course.
The alternative is to spend days just to download and try out various libs and appelets.
Or a couple of hours investigating encryption algos and finding a lib that supports the one that's right for your purposes. All it takes is a little bit of research.
-- Corey Murtagh The Electric Monk "Quidquid latine dictum sit, altum viditur!"
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