Encryption Library

[eluser]Coder Death[/eluser]
Thanks @PhilTem,
But the problem is that, sometimes also the '+' and '.' characters are inside the encrypt string.
I would like to know more about the encryption string in CodeIgniter
Does it generate only characters amount [a..z,A..Z]
If yes I think I will do a

Code:

replaceAll('=,+,..',$mystring);

to remove all unwanted characters
Thanks