An embodiment provides a method, including: detecting, at a touch sensitive surface of an information handling device, user input including at least one multi-touch input; said detecting comprising detecting two or more substantially simultaneous user inputs to the touch sensitive surface; associating, using a processor, a number with the at least one multi-touch input; determining, using the processor, if the user input matches expected user input; and responsive to determining a match, authenticating a user. Other embodiments are described and claimed.