Abstract
Security issues in cloud computing is one of the major reasons in slowing down its adoption by businesses and among these issues: weak user authentication. In fact, the use of text password is still relatively widespread, especially, for authentication in a cloud environment. Therefore, numerous approaches have been proposed to overcome this problem such as graphical passwords, biometric scans and 3D password objects. In this paper, we propose a cloud-based two-factor authentication framework called Two Levels Authentication Cloud (2LAC). The framework uses an image and a secret watermark as factors of authentication. Experimental results illustrate that 2LAC offers an efficient mechanism for enhancing user authentication in the cloud environment and can eliminate common types of attacks.
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