Burp Sequencer is a tool for analyzing the quality of randomness in a sample of data items. You can use it to test an application's session tokens or other important data items that are intended to be unpredictable, such as anti-CSRF tokens, password reset tokens, etc.
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This release gives the Scanner the capability to report all instances where user input is returned in application responses, both reflected and stored. The information gathered is primarily of use to manual security testers. Some applications contain numerous instances of input retrieval, since it is very common for the entire URL to be reflected within responses. For these reasons, the new Scanner checks are off by default, but can be turned on in the Scanner options.