Abstract: The present invention provides a method for recovering a device (D). The method comprises the steps of acquiring a recovery code with the device (D) to be recovered, matching an inherence factor of a user recovering the device (D) with an inherence factor of a user which is assigned to the device, and allowing a recovery of the device (D) if the inherence factor of the user recovering the device and the inherence factor of the user which is assigned to the device sufficiently matches. A further method is provided which comprises the steps of connecting the device (D) to be recovered to a cloud storage in which a backup of the device is stored, requesting a knowledge factor from the user recovering the device (D), allowing a recovery of the device (D) if the possession factor is correctly inputted into the device (D) to be recovered. Further an App is provided which can be stored on a device, which App contains instructions for carrying out the method.

Abstract: A method of device authentication comprises receiving a password into an application of a user device; transmitting verification information of the password from the application to an authentication device; verifying, by the authentication device, validity of the password using the verification information; granting, by the authentication device, access by the user device to a secure resource when the password is valid; sending no indication of an invalid password to the user device when the authentication device determines the password is invalid; and blocking access of the user device to the secure resource when a predetermined number of passwords are determined to be invalid by the authentication device.