I have a small userid (6 digits) that I want to use as a url for renewing a subscription, such as:

http://www.mysite.com/renew.cgi?id=213455

But I don't want to have the id in plain view like that (been told that's bad {why?}). I've been playing around with CBC & Blowfish, but the resulting encryption is too long (it will make the line wrap, which will break the link in some mail clients I plan on e-mailing the link to.

So my question is, is there an available encryption scheme that will encrypt that (and decrypt the encrypted string) where I can specify the length of the encrypted string, or where the length of the encrypted string is not-so-long. (crypt() isn't too long, but I need to decrypt, so that's out)

Thanks!

Jason

In reply to Encryption Question by Purdy

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