Abstract: A method performed by a server for authentication at a service provider includes generating a sequence X of secret locations SLn and deceiving locations DLk associated with an image, wherein the deceiving locations DLk are associated with a random array Vi of vibrations pattern, wherein i, n, and k are integers with k smaller than n, and granting access to an electronic device to the server when taps received from the electronic device, and associated with the secret locations SLn and the deceiving locations DLk, correspond to the sequence X. Each vibration of the random array Vi of vibrations pattern is associated with a corresponding deceiving location DLk.