![]() The passwords may then be tried against any account online that can be linked to the first, to test for passwords reused on other sites. ![]() Usually passwords are not tried one-by-one against a system's secure server online instead a hacker might manage to gain access to a shadowed password file protected by a one-way encryption algorithm, then test each entry in a file like this to see whether its encrypted form matches what the server has on record. A hacker can use or generate files like this, which may readily be compiled from breaches of sites such as Ashley Madison. ![]() If your password is on this list of 10,000 most common passwords, you need a new password.
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