Encryption Library

[eluser]PhilTem[/eluser]
Nope, the encryption library or the encode method respectively don't only create alphanumeric characters in the encoded string. I think it does some base64_encode. That's also where both equality signs come from.
However, if you just trim the last two characters from your string and not replace '=' with '' it should work (since trimming is something else than replacing )

If you want to know more about the encryption library, just have a look at the source code (since it's open source you can do so ). This way I understand a whole more of CI and it's internal business logic. I can only recommend to everyone that seriously wants to work with CI.