Bip39 Github. Because of the cryptographic style and design of BIP-39, a weak passphrase won't reduce the protection of the opposite wallets or assist reveal the seed words. Mnemonics are representation of entropy. Starting point requires generating a decision as to just how much entropy you consider Safe and sound https://icelisting.com/story20151727/bip39-mnemonic-https-linktr-ee-bip39-not-known-factual-statements-about-ian-coleman-bip39