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Online examination system is a web-based examination system where examinations are given online. Research and comparison for different web examination system in the current individual field, proposed a set of design mode about general examination platform which apply in colleges and universities, research and analysis the key technology, and proposed improved scheme, made system being perfect. The major problems in online examination system is authentication of candidate and stop malpractices during examinations. For proper authentication, authorization process to ensure that the right candidate is appearing for the exam we will work on pixel enhancement for clear visibility. We will also work on making a system in which it not just detects and captures front camera picture but also the rear facing camera. We will work on audio enhancement to reduce the background noise of wind and any distortion in the audio making it clearer to analyse. Data encryption plays an important role in preventing unauthorized access to question banks. It also helps to avoid result manipulation and blocks access without valid credentials. It is a vital feature to ensure the security of the examination. The entire communication between server and examination client is also encrypted with a secure mode of communication. We will make sure that only the one who is conducting the exam has full access and will be alerted if someone try to do malpractice during the exam.