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User authentication is a crucial requirement for secure transactions and access to the sensitive resources on the Web. We propose, implement and evaluate a Zero-Knowledge Proof Authentication (ZKP) algorithm based on isomorphic graphs. The proposed mechanism allows for authentication with varying confidence and security levels. We suggest that most of the computations should be carried out by the user's web browser without revealing password or login at any point in time; instead generateddoi:10.1145/1456223.1456241 dblp:conf/wstst/GrzonkowskiZZM08 fatcat:l44z6a3idzhr7nigy4pmzbnxnm