In December 2009, a critical data breach in the Internet has been experienced. Around 32 million user passwords of rockyou.com web portal were stolen by a hacker which had used SQL injection for his attack. He got all passwords and made them anonymously (i.e. without usernames) available in the Internet to download.

Security experts started analyzing the passwords and Imperva released a study regarding the security level of the passwords. They have come up with the following results:
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