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Penetration testing (PenTest) is the cycle to distinguish security weak points in an application by assessing the system or network with different malignant strategies. The weak areas of a system are exploited in this cycle through an approved simulated attack. The objective of this test is to get significant information from hackers who have unapproved access to the system or network. When the weak spot is distinguished it is used to misuse the system to access critical data. A penetration test is otherwise called the pen test and an outside contractor is likewise known as an Ethical hacker. The pen testing cycle can be divided into five phases: 1. Planning and Reconnaissance The first stage includes: Characterizing the scope and objectives of a test, involving the systems to be dealt with and the testing strategies to be used. 2. Scanning The subsequent stage is to see how the target application will react to different interruption endeavors. This is normally done using, Static analysis: Estimating an application's code to assess how it acts while running. These devices can check the whole of the code in a single pass Dynamic analysis: Inspecting an application's code in a running state. This is a more functional method of examining, as it gives an actual view into an application's execution 3. Getting Access This stage uses web application attacks, for example, cross-site scripting, SQL injection and backdoors, to reveal a network's weaknesses. Testers at that point attempt and misuse these weaknesses, commonly by escalating privileges, stealing information, intercepting traffic, and so on, to comprehend the harm they can cause. 4. Maintaining and securing access The objective of this stage is to check whether the weakness can be used to get a constant presence in the exploited system. The intention is to copy advanced persistent threats, which usually stay in a system for a long time to take an organisation's most critical information. 5

Beta testers have disclosed that the preview version of Allo also features end-to-end encryption (using the Signal protocol) with unique identity keys for each individual users.