Authentication systems using sequences of tile selections from a grid

A method for authenticating to a computer system, the method comprising:

• sending, from a user device, a username to a server;
• receiving, at the user device, a color set from the server and presenting a grid of a plurality of colored tiles, each colored tile having a color specified by the color set;
• receiving, at the user device, user input specifying a sequence of tile selections, each tile selection within the sequence of tile selections specifying a user selection of one of the colored tile;
• and
• sending, from the user device, the sequence of tile selections to the server;
• receiving, at the user device, an indication of granting or rejecting a request for authentication based on the sequence of tile selections.

A server for authenticating to a computer system, the sever comprising:

• one or more processors and memory storing executable instructions for the processors;
• and
• an authenticator implemented on the processors and memory, the authenticator configured for performing operations comprising:
• receiving a request from a user device for authentication, the request specifying a username;
• determining grid information associated with the username by accessing a repository of grid information for a plurality of usernames, the grid information specifying a color set;
• sending the color set to the user device, causing the user device to display a grid of a plurality of colored tiles, each colored tile having a color specified by the color set;
• receiving a sequence of tile selections from the user device, each tile selection within the sequence of tile selections specifying a user selection of one of the colored tiles;
• and
• granting or rejecting the request for authentication based on the sequence of tile selections and the grid information associated with the username.