Replay attack detection

A method, comprising:

• receiving an image of a card reader peripheral device captured by a camera;
• evaluating a first region of interest in the image for changes associated with non-busy components of the card reader peripheral device;
• instructing the card reader peripheral device to move at least one busy component from a current state to a different state;
• evaluating a second region of interest in the image associated with the at least one busy component after instructing the card reader peripheral device to move;
• and
• processing a security operation when the second region of interest does not show the at least one busy component in the different state.

A method, comprising:

• monitoring a card reader peripheral device using a camera that captures images of components of the card reader peripheral device;
• evaluating a first area of interest in the images for changes associated with non-busy components;
• periodically instructing the card reader peripheral device to move at least one busy component to a known position;
• switching from evaluating the first area of interest to evaluating a second area of interest in the images after instructing the card reader peripheral device to move the at least one busy component;
• and
• raising a security alert when the second area of interest does not show the at least one busy component in the known position.

A system, comprising:

• a host device including a camera and a card reader peripheral device;
• and
• a processor configured to execute instructions to perform operations comprising:
• monitoring first images captured by the camera of non-busy components of the card reader peripheral device;
• determining changes in the non-busy components from the first images;
• periodically instructing the card reader peripheral device to move busy components from an idle state;
• evaluating second images captured by the camera after instructing the card reader peripheral device to move the busy components;
• and
• processing a security operation when the second images do not show movement of the busy components from the idle state.