Skill Authenticate:

Authentication is the act of proving an assertion, such as the identity of a computer system user. In contrast with identification, the act of indicating a person or thing's identity, authentication is the process of verifying that identity. 

The process or action of proving or showing something to be true, genuine, or valid. Computing the process or action of verifying the identity of a user or process. And user authentication for each device ensures that the individual using the device is recognized by the company. The prints will be stamped with his seal and accompanied by a letter of authentication.