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Burp Suite Cookbook by Sunny Wear

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Performing process-timing attacks

By monitoring the time an application takes to complete a task, it is possible for attackers to gather or infer information about how an application is coded. For example, a login process using valid credentials receives a response quicker than the same login process given invalid credentials. This delay in response time leaks information related to system processes. An attacker could use a response time to perform account enumeration and determine valid usernames based upon the time of the response.

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