Ophcrack Password Cracking Tool Free Download

Cracking a Windows Password with Ophcrack with the use of rainbow tables, relatively easy if you take the right steps and if the computer can boot from a disc. The free, open source Ophcrack Live CD is a Windows account password cracking tool designed to help you recover lost Windows passwords.

Whether you need to recover the lost password to a Windows account, you’re looking to ensure that your passwords are secure, or you’re a super l33t h4x0r, the Ophcrack Live CD is a pretty useful tool.

The Ophcrack Project has recently released a Linux Live-CD based on SLAX that can be used to retrieve and crack passwords from Windows machines with little or no effort.

Cracking a Windows Password with Ophcrack with the use of rainbow tables, relatively easy if you take the right steps and if the computer can boot from a disc. The free, open source Ophcrack Live CD is a Windows account password cracking tool designed to help you recover lost Windows passwords. Whether you need to recover the lost password to a Windows account, you’re looking to ensure that your passwords are secure, or you’re a super l33t h4x0r, the Ophcrack Live CD is a pretty useful tool. The Ophcrack Project has recently released a Linux Live-CD based on SLAX that can be used to retrieve and crack passwords from Windows machines with little or no effort.

OphCrack is a free rainbow table-based password cracking tool for Windows. It is the most popular Windows password cracking tool but can also be used on Linux and Mac systems. It cracks LM and NTLM hashes. For cracking Windows XP, Vista and Windows 7, free rainbow tables are also available.

A live CD of OphCrack is also available to simplify the cracking. One can use the Live CD of OphCrack to crack Windows-based passwords. This tool is available for free.

ne of the basic tenets of information security is to ensure that systems use strong passwords, namely those of a certain length that mix letters, numbers and other special characters. One way to determine if your password is strong is to type it into a password checker, like Microsoft’s Password Checker. The software giant’s tool checks for sufficient length and complexity.

ophcrack - Windows Password Cracking Tool - SecTechno

These more complicated passwords are considered “strong” because they take a longer time to crack than shorter, easier-to-guess passwords. But even strong passwords can be cracked in seconds using an open source tool called Ophcrack.

Ophcrack is an extremely fast password cracker because it uses a special algorithm called rainbow tables. Brute-force cracking tools typically try thousands of combinations of letters, numbers and special characters each second, but cracking a password by attempting every conceivable combination can take hours or days. Rainbow tables pre-computes the hashes used by passwords, allowing for a speedy password lookup by comparing the hashes it has, instead of computing them from scratch.

Thinking of it another way, someone else has already generated the password hashes for millions of potential passwords using the same algorithm as Windows XP and Vista. Ophcrack simply loads the megabytes of hashes it already has and compares the password hash in Windows against its giant database. When it finds a match, Ophcrack reveals the password in plain text. 

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Ophcrack works on LAN Manager (LM) and NT LAN Manager (NTLM) hashes, and has rainbow tables available for cracking Windows XP and Windows Vista passwords. It comes with a slick GUI and runs on Windows, Linux/Unix, Mac OS X, or from a bootable LiveCD. Ophcrack has the ability to obtain password hashes from the Security Accounts Manager (SAM), the registry database that Windows uses to store protected user passwords.

Ophcrack is not malware and has its legitimate uses. For instance, most Windows password-recovery tools will substitute a new password in place of a lost one, but knowing the actual password may be useful in unlocking other archives found during a forensics investigation. Additionally, testing a known password against Ophcrack, and besting the rainbow tables, can help validate that the password is extremely strong.

However, one of the tools Ophcrack uses to access the SAM is pwdump, which many virus scanners will flag and quarantine as malware during installation because of its ability to create surreptitious remote connections used for spiriting out data. Ophcrack requires pwdump in order to dump the hashes in the SAM, so its association with pwdump may present some ethical hackers with an uncomfortable level of risk.

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