Abstract: A method for authentication is provided comprising: displaying, by an electronic device, a first screen including first objects, each first object being associated with a respective value; detecting a first gesture performed on a first set of the first objects; identifying a first operation based on the first gesture; performing, by the electronic device, the first operation using the respective values of the first objects in the first set as operands to obtain a first result; computing an input string based on the first result; detecting whether the input string matches a predefined password; and authorizing access to the electronic device in response to the input string matching the predefined password.