What is the best password length?

Related questions

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4. Which is better LastPass or 1password?
5. What makes for a good password?
6. Should I use a passphrase for ssh key?
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Tags

1. #perfect
2. #password
3. #passwords
4. #least
5. #random
6. #author
7. #usually
8. #better
9. #longer
10. #burnett
11. #characters