Account security system

A fraud detection method comprising:

• receiving a first electronic image from a first user device while the first user device effectuates a first transaction;
• storing the first electronic image from the first user device;
• associating the first electronic image with the first transaction;
• receiving a second electronic image from a second user device while the second user device effectuates a second transaction;
• storing the second electronic image from the second user device;
• associating the second electronic image with the second transaction;
• receiving a fraud notification associated with the first transaction;
• retrieving the first electronic image;
• analyzing the first electronic image to detect an identifying characteristic;
• determining whether the identifying characteristic is present in the second electronic image;
• identifying a second account when the identifying characteristic is in the second electronic image;
• and
• preventing access to the second account when the identifying characteristic is determined to be present in the second electronic image above a known degree of certainty.

A system comprising:

• a customer authentication system configured to authenticate a customer to access an account associated with an account identifier provided by a user device;
• an account server configured to:
• retrieve account information when the customer authentication system authenticates the customer;
• receive the account information;
• determine whether an image authentication preference is on;
• provide a prompt to the user device to activate a camera on the user device when the image authentication preference is on;
• receive an electronic image from the user device when the prompt is accepted;
• and
• deny access to the account when the prompt is not accepted.