Bitcoin Q&A: Passphrases and seed storage

andreasantonopoulos
storage
passphrase

#1

Do passphrases protect against leaks or compromises of mnemonic seed words? Why are brain wallets usually insecure? Why should you not “roll your own crypto” and promote creative schemes that deviate from the standards (like BIP39), without at least getting peer review and testing from other developers, cryptographers, or security researchers?