A recent research study has found brute-force hacking can crack an 8-character password in about one hour. The same study also found any password with less than seven characters can be brute-forced "instantly." The time it takes to brute-force a password has significantly been reduced due to advances in both computing power and the methods used by hackers.
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If you are currently using passwords that are easy to crack, update them to strong passwords of at least 10-characters with a mix of uppercase, lowercase, numbers, and symbols. If you have trouble remembering all your passwords, set up a password manager.