A sort of a "fuzzer".
Hydra takes network fuzzing and protocol testing to the next level by corrupting traffic intercepted 'on the wire', transparent to both the client and server under test. This means that security testing can be performed using your ordinary functional tests as drivers. Hydra also supports application-layer record/playback, which overcomes the limitations of sequence/acknowledge conflicts and timing. -- http://www.securityinnovation.com/company/ourtechnology/hydra.shtml
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