| 摘要 |
A device (100) for authenticating a user (130) is provided, the device being configured to receive characters typed by the user using a keyboard (112) operable as input device for the device, and, for each typed character, acquire an image from a camera (120) configured for imaging the keyboard,determine which finger of a hand is used for typing the character, and derive a respective transformed character from the received typed character based on the finger (151–153) used for typing the character. The finger used for typing the character is determined by image processing. The camera may optionally be configured for imaging a reflection (163) of the keyboard by a cornea (162) of the user. By taking into account which fingers are used for typing characters related to authentication or access control on a keyboard, such as passwords, an increased level of security for is achieved. |
