:In wireless communications, significant information are getting exchanged frequently. Inorder to avoid the illegal access of that sensitive information remote authentication is being done extensively. Remote authentication involves the submission of encrypted information, along with visual and audio cues. Incase of remote examination or interviewing, Trojan Horse and other attacks can cause severe security threats to the sensitive information. Inorder to overcome these issues regarding security, we propose a robust authentication mechanism based on encryption and watermarking(data hiding). Assume that a user wants to be remotely authenticated, initially user’s video object (VO) is captured by using a camera. Next, one of his/her biometric signals is encrypted by using Blow fish algorithm. Then the encrypted biometric signal and the captured human face is watermarked using LSB(Least Significant Bit) Algorithm.The LSB algorithm will read the encrypted biometric image and find the RGB value of each pixel. Then embed it into the appropriate RGB value of the captured human face. This enhances the security of the user information and remote authentication can be done more securely.