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The testing method Fuzzing can be used for input validation and data validation for a web application.
The purpose of fuzzing, also known as fuzz testing, is to identify applications with weak input validation. Fuzzing aids in identifying instances where an application makes incorrect assumptions about the data supplied by users by sending incorrect or corrupted data to the application.
Many programmes are built to accept and use data from unreliable users. This could be as straightforward as requesting a name or email address or as complicated as carrying out a transaction on the blockchain.
These programmes frequently assume certain things about the data that is given to them. For instance, it is typical to assume that names have a certain maximum length and are made up of letters (possibly in multiple languages).
It's possible for authorised users of an application to "follow the rules" when entering input, but this isn't always the case for errant users or potential attackers. Bad input could break the application or compromise its security if an application makes assumptions about user-provided data without verifying that the user-provided data satisfies these assumptions.
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