Maryland Commercial Law Section 4A-201
§ 4A-201.
  (a)   "Security procedure" means a procedure established by agreement of a customer and a receiving bank for the purpose of:
    (1)   Verifying that a payment order or communication amending or cancelling a payment order is that of the customer; or
    (2)   Detecting error in the transmission or the content of the payment order or communication.
  (b)   A "security procedure" may require the use of algorithms or other codes, identifying words or numbers, encryption, callback procedures, or similar security devices.
  (c)   Comparison of a signature on a payment order or communication with an authorized specimen signature of the customer is not by itself a "security procedure".