![]() ![]() ![]() 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. 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. 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. Ophcrack is an extremely fast password cracker because it uses a special algorithm called rainbow tables. But even strong passwords can be cracked in seconds using an open source tool called Ophcrack. These more complicated passwords are considered "strong" because they take a longer time to crack than shorter, easier-to-guess passwords. ![]()
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