
For example, some commercial products can test trillions of passwords per second on a standard desktop computer using a high-end graphics processor. Modern graphics hardware makes this incredibly fast. Their goal generally isn’t to crack an individual password, but to run tests against the entire file, knocking down their targets one by one.
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Once criminals obtain a password list they can take as many shots as they like to break it.

These files may be protected with weak encryption algorithms, which are not much of an impediment to the determined hacker.

These files are usually easy to access from the root level of most server operating systems or are maintained by individual applications. Rather, the pros work against password files that they download from breached servers. That process is slow to begin with, and most services will lock out repeated login attempts anyway. It’s important to understand at the outset, that professional password crackers aren’t looking to log in to your PayPal account.
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Let’s look at how each technique works and how to protect against them.

There are dozens of password cracking programs on the market, each with their own special recipe, but they all basically do one of two things: create variations from a dictionary of known common passwords or attempt every possible combination using a method called a brute force attack. Cracking a password may seem like a next to impossible task, but you’d be surprised how easy it can be.
