Ask Encryption Service

How to pass binary string from CI4 Encryption service encrypt , from controller to view or reverse.
and how to design the output encrypt, to alphabetic character only || Or integer only 0 to 9

--- Edit ---
i use basic decrypt
$this->encrypter->decrypt($variable)
in the controller
work like charm

thank you

How to prevent Encryption Service CI4 to use special character like 

Code:

/\:()