Method for distinguishing a live actor from an automation

摘要

A computer-implemented method is presented for distinguishing a live actor from an automation. The method includes receiving, from a user, a request to access a service, and, in response presenting to the user a minority set of N objects and a majority set of N objects that share at least one common attribute expected to be apparent to a human observer absent among objects associated with the minority set. The method also includes requesting, from the user, to identify at least one object, from among the objects associated with the minority or majority set, that satisfies a predetermined criterion and receiving, from the user, an indication of a selection of at least one object. The method further includes determining whether the user-selected object satisfies the predetermined criterion and determining that the user is a human upon determining that the user-selected object satisfies the predetermined criterion.