Date Added: Nov 2011
Authentication is the art of confirming the truth of an attribute of an entity. Entity may be a person. If a entity is a person it can authenticate with the help of its traits such as his facial attribute, fingerprinting attribute, retina attribute, palm attribute, signature of a person, password, token attributes etc. There are so many attacks to which these techniques are vulnerable. So, today the security of the authentication system is becoming a burnt issue. Keeping in the view, the importance of the authentication systems, the authors analyze various authentication techniques in their paper.