Authentication Protocols Using Multi-level Cognitive CAPTCHA

Abstract

This paper will present new approaches for creation of authentication protocols, which use multi-level CAPTCHA codes. Proposed codes will create a new class of cognitive CAPTCHA, which require special skills for fast and secure personal authentication, which can be performed is several stages. Authentication protocols can be oriented to allow access for trusted group of persons, based of theirs perception abilities and cognitive skills. For new authentication protocols some possible examples of applications will be also presented.