This is my concern about the safety of Bitcoin hardware wallets. I understand why each complete word 'Mnemonic' is used instead of a private key 🔑 composed of meaningless characters. BTC Wallet
But, no matter how low the probability, I was uneasy about how to prevent a random brutal attack if I only used a certain combination of specific words.
However, I just discovered that we can random passphrase to BIP39, which decreases the success chance of a random brutal attack from 2^128 to 5.9*10^197. Ok, this cannot be solved even with a supercomputer.
If your hardware wallet supports the passphrase function in addition to BIP39, and you are using this function🔒, you can sleep comfortably without worring anymore.
You bitcoin is safe. 😃
we can 'add' random passphrase 😆
well laid out on this site:
this twitter thread.