This is a simple method of encoding that uses two-character modules to encrypt a simple string. Capital letters are processed through a costume-based capital detection system which checks for when a character causes the sprite to switch to one of the 26 capital costumes, then adding 26 to the encoded number value. This method is useful for encoding regular letter-and-symbol based strings into cloud variable-compatible strings.
I coded this in like 5 minutes :P Code is available for backpacking in the project as long as you give credit to the original creator (me).