Bip39 Checksum. Thanks to the cryptographic layout of BIP-39, a weak passphrase will not reduce the security of the other wallets or aid expose the seed words. Any time you include a passphrase towards your seed phrase, it entirely variations the derived non-public keys and public addresses on your wallet. https://bookmarkspy.com/story20003415/bip39-mnemonic-https-linktr-ee-bip39-the-fact-about-bip-39-that-no-one-is-suggesting