User authentication at an electromechanical gun

A method for authenticating a user of a gun, the method comprising:

• receiving, at the gun, a user-input granting permission to log data related to authentication attempts at the gun;
• receiving, from a first authentication sensor of the gun, first query data associated with the user;
• unlocking a fuzzy vault based on the user-input and the first query data;
• receiving, from a second authentication sensor of the gun, second query data associated with the user;
• performing, based on the first query data associated with the user, an authentication procedure to determine whether the first query data or the second query data matches enrollment data stored in memory of the gun, wherein a match is determined based on the first query data or the second query data and the enrollment data satisfying a similarity threshold;
• logging, based on the user-input, an indication of a result of the authentication procedure in the fuzzy vault, the fuzzy vault storing the indication of the result in the memory of the gun, wherein the result of the authentication procedure is a successful authentication of the user or an unsuccessful authentication of the user;
• determining, based on the authentication procedure, that the user is authorized to operate the gun;
• and
• transmitting a signal in response to the determining that the user is authorized to operate the gun, the transmitting the signal causing the gun to enter an active state which allows the gun to be fired.