Encrypt String while restricting certain characters

From: ScriptNFool (ScriptNFool_at_hotmail.com)
Date: 07/07/03 

Date: 6 Jul 2003 15:57:44 -0700

Is it possible to encrypt a string but restrict certain characters in
the output?

For example, I'm trying to encrypt the value of a QueryString item in
a web URL, and any '=' signs or '&' signs would cause problems with
the rest of the QueryString.

I'm pretty new to encryption, so I don't know if this is a relatively
easy thing to do. Any help would be greatly appreciated.

-SF

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