A password like “jack and jill went up the hill” may be long, but it is also a known phrase that attackers are likely to try as part of a dictionary attack, and if compromised, would give attackers a clue as to what your other passwords might be. Adding just four characters increases that time to three years. An 8-character password, for instance, would only take about three hours to crack by brute-force. Long passwords are stronger than short passwords because, as length increases, it takes exponentially longer for a modern computer to try every possible combination of characters, a technique called brute-forcing. Therefore the strongest passwords are long, random, and unique. A password’s strength is defined by how difficult it would be for an attacker to crack or guess.
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