The system and method of the invention in one embodiment provide a Pseudo-Isochromatic challenge or puzzle or any other visual illusion generated on the basis of Pseudo-Isochromatic imagery (PICPVI), to be employed within a challenge generator. The invention is created in such a way as to make it extremely difficult for an automated process to read, decipher or otherwise interpret the PICPVI but relatively easy for the human end user to successfully complete. In one embodiment the end user issues a request to a service provider for access to services, the service provider requests HIP by generating a PICPVI. The PICPVI is generated for the user and the response can be provided as the whole or part of the access to service request.
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