Are passphrases secure?

Related questions

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2. What is my passphrase?
3. What is password entropy?
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5. Where can I find my wpa2 password?
6. What are all the 4 digit combination possibilities?
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Tags

1. #accounts
2. #means
3. #managers
4. #remember
5. #security
6. #passphrase
7. #string
8. #guess
9. #unlock
10. #chances
11. #dozens
12. #entered
13. #online
14. #would
15. #cracking
16. #encryption
17. #private
18. #passphrases
19. #single
20. #regarded
21. #characters
22. #access