The document discusses authentication methods and describes GrIDsure Enterprise, which uses a personal identification pattern (PIP) for authentication. At registration, a user selects cells in a grid to create their PIP. During login, the user is shown a challenge grid and must enter the code for their PIP. Different challenge grids are shown each time for added security. The system creates one-time passcodes that are stronger than passwords but don't require additional hardware. It provides high security, ease of use, and accessibility without deploying or maintaining equipment.