When a user authenticates, the entered password is hashed too. A variable length password is transformed in a fixed length code (‘hash’) and stored. To prevent this, one-way hashing was introduced. It didn’t take long to figure out that this was not a good idea: a breach of the system resulted in hackers having instant access to all accounts. In the old days, passwords were stored in plain text. To answer this, first we need to look at the basics. Users occasionally ask us how we can crack passwords on such a large scale. At the time of writing, our database includes nearly four billion - yes, that is with a B - plaintext passwords. Verified account owners can access their own information and take appropriate action to keep their accounts safe and prevent against account takeovers. We continuously collect publicly available hacked databases and try to crack the corresponding passwords. This includes services that you might be using. Scattered Secrets is a password breach notification and prevention service.
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