Abstract: A system is provided to monitor a user's interaction with a computer. The system may comprise a random reference data generator to generate a random reference string, an image generator to create an image including the random reference string, a modification module to iteratively modify the image until a distortion criterion is satisfied, and a communications module to communicate the image to a client computer for display to a user. The random reference string comprises a plurality of alphanumeric characters.

Abstract: A system is provided to monitor a user's interaction with a computer. The system may comprise a random reference data generator to generate a random reference string, an image generator to create an image including the random reference string, a modification module to iteratively modify the image until a distortion criterion is satisfied, and a communications module to communicate the image to a client computer for display to a user. The random reference string comprises a plurality of alphanumeric characters.

Abstract: A system is provided to monitor a user's interaction with a computer. The system may comprise a reference string generator to generate a random reference string, an image generator to generate an image including the random reference string, a communications module to communicate the image to a client computer for display to a user and to receive user input data and a comparator to compare the random reference string and the user input data to detect human interaction with the computer. The image including the random reference string may be generated such that each character in the random reference string is off-centered.

Abstract: A method of, and system for, monitoring interaction between a user and a computer is provided. The method includes generating an image including random reference data readable by the user, and communicating the image to the computer for display to the user. User input data is then received and a comparison between the random reference data and the user input data is performed to determine if the user is interacting with the computer.

Abstract: A method of, and system for, monitoring interaction between a user and a computer is provided. The method includes generating an image including random reference data readable by the user, and communicating the image to the computer for display to the user. User input data is then received and a comparison between the random reference data and the user input data is performed to determine if the user is interacting with the computer.