Encrypt <--> Decrypt

Hello List, I never used encryptions before. What I want to do is to pass a variable via get form, I do not want it to be visually understandable. However when time comes (after few actions) it will be freely shown to the user. I though that I could encrypt it and (decrypt) it later. But I cannot find any way to decrypt anything, I found few discussions in forums saying that there's no way to do it but instead you can compare... I got it, but what if a string must be visually understandable and/or sometimes not.. ? Any idea how can I do it? Thanks guys. Maxim Maletsky - maxim@j-door.com <mailto:maxim@j-door.com> Webmaster, J-Door.com / J@pan Inc. LINC Media, Inc. TEL: 03-3499-2175 x 1271 FAX: 03-3499-3109 <http://www.j-door.com/> http://www.j-door.com <http://www.japaninc.net/> http://www.japaninc.net <http://www.lincmedia.co.jp/> http://www.lincmedia.co.jp