Is Diceware really secure?

Related questions

1. Do strong passwords accomplish anything?
2. What password should I use?
3. How long is a secure password?
4. What are password requirements?
5. What does Enter passphrase mean?
6. Why Longer passwords are more secure?
7. Is a sentence a good password?
8. What is a robust password?
9. What is the easiest password manager to use?
10. What is a security phrase?

Tags

1. #humans
2. #composed
3. #remember
4. #words
5. #special
6. #theory
7. #because
8. #characters
9. #diceware
10. #simple
11. #often
12. #generating
13. #containing
14. #practice
15. #passphrases
16. #passwords
17. #secure