Electromechanical lock

A method for operating an electromechanical lock, comprising:

• storing a challenge in an electronic circuitry;
• receiving wirelessly from a communication device operating power for
• providing a wireless interface for the communication device to read the challenge and
• receiving and storing a response from the communication device;
• receiving with the user interface of the lock input from a user, generating from the input the operating power for
• authenticating the response;
• issuing an open command provided that the authentication is successful and
• setting the lock in a mechanically openable state in response to the open command.

A computer program product encoding a computer program of instructions for executing a computer process carrying out the steps of:

• storing a challenge in an electronic circuitry;
• receiving a Near Field Communication query from a communication device;
• providing a wireless interface providing an interface for a communication device to read the challenge using Near Field Communication;
• receiving a response from the communication device using Near Field Communication,
• storing and authenticating the response;
• and
• issuing an open command provided that the authentication is successful.