24. The method of claim 18 , wherein at least one of the selected substring of the sensitive string of characters and the selected substring of the intermediate tokenized string of characters comprises numerical characters, and wherein at least one of the first and second tokens comprises alphanumerical characters.
24. The method of claim 18 , wherein at least one of the selected substring of the sensitive string of characters and the selected substring of the intermediate tokenized string of characters comprises numerical characters, and wherein at least one of the first and second tokens comprises alphanumerical characters. 25. The method of claim 24 , further comprising replacing the at least one of the selected substring of the sensitive string of characters and the selected substring of the intermediate tokenized string of characters comprising numerical characters with a token comprising alphanumerical characters.