A Security Fuzzer is a tool designed to provide random data (fuzzing testing) to an application’s parameters. In the context of web application testing, fuzzing means testing especially for buffer overflow, parameter format check, various encoding and error handling.

Wfuzz is a tool designed for bruteforcing Web Applications, it can be used for finding resources not linked (directories, servlets, scripts, etc), bruteforce GET and POST parameters for checking different kind of injections (SQL, XSS, LDAP,etc), bruteforce Forms parameters (User/Password), Fuzzing,etc.

A captcha (an acronym for “completely automated public Turing test to tell computers and humans apart”) is a type of challenge-response test used in computing to determine whether or not the user is human.