Secure passcode entry using a mobile device having augmented reality capability. The mobile device is registered with an authorization server to register an agreed input display algorithm with an initialization seed, and a user passcode is registered with the authorization server. A superset of options is obtained from an input interface device at which a user passcode is to be entered. The superset of options is processed using the input display algorithm and initialization seed to result in an arrangement of characters including the characters of a registered user passcode. The arrangement of characters is overlaid using the augmented reality capability of the mobile device in relation to an input interface of the input interface device.