Hydra was tested to compile on Linux, Windows/Cygwin, Solaris 11, FreeBSD 8.1, OpenBSD, OSX,QNX/Blackberry, and is made available under GPLv3 with a special OpenSSL license expansion. In the latest update hydra development is moved to public github repository at. Hydra was written by van Hauser and its additionally supported by David Maciejak. This tool makes it possible for researchers and security consultants to show how easy it would be to gain unauthorized access to a system remotely. It is very fast and flexible, and new modules are easy to add. Hydra is the fastest network logon cracker which supports numerous attack protocols. it is a trial and error method like guessing, attempt to decode encrypted data such password or data encryption used by application program or “hacking tool”. The most popular of this kind of credential attack is, brute force. There are many ways a password can be weak corresponding to the strengths power of various attack schemes. Weak passwords, on the other hand shorten the time necessary to guess and gain access to personal/corporate e-mails, sensitive data like financial info, business info, credit cards, etc. It measures the effectiveness in resisting of guessing or breaking it. The strength of a password is a function of length, complexity, and unpredictability. After typing “PASSWORD”, the system turns off the printing mechanism, if possible, so that the user may type in his password with privacy. It had a login command that requested a user password. One of the first time sharing systems, was introduced in 1961. Passwords have been used with computers since the earliest days of computing. It must be kept in secret and hidden from others who are not allowed to access those resources. A password is technically defined as secret string of characters used to authenticate or gain access to resources.

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