A Library in C++ for Graphical Password and Human Verification

A graphical authentication method is implemented through selection of discretized points on an image. Discretization is used in click-based graphical passwords so that approximately correct entries can be accepted by the system. For human verification, we make use of a grid of images where users are asked to select certain images matching a common feature or description, as an alternative against text-based verification. This is a library of a security system, which provides an API for authentication and human verification.