I recently tried out a decentralized private messaging tool, it didn’t ask for my personal information to register.
Instead, it only asked me to create a username and set a password, after which it provided me with a mnemonic passcode. (I had never used a mnemonic passcode before, but I learned that it’s a web3 or decentralized type of thing.)
On their FAQ page says “The Mnemonic Passcode is your ONLY SOURCE of backup in a scenario where your device breaks down or becomes unusable due to any reason. In such cases, all you need is your Mnemonic Phrase to recover all your account information. It must be copied, screen-shotted, or written down and kept in a safe and secret place until it is needed.”
Does Mnemonic Passcode more secure than usual password? Plus, is there any other ways to keep you mnemonic phrase?
I was referencing the example of the OP, and that was 18 words.
But we can do the math for more realistic passwords/passphrases.
Password with 8 characters and 60 unique symbols: ~10^14 combinations
Passphrase with 4 words and 5000 unique symbols (words): ~10^16 combinations
Passphrase with 5 words and 5000 unique symbols: ~10^20
So yes, 4-5 words beats 8 characters. You can do the math yourself for any combination you want.
It’s just [number of unique possible symbols] ^ [number of characters/words in the password].
thank you!