Bip39 seed phrase https://www.storeboard.com/myrtierisaliti Regardless that it takes advantage of BIP32 technique it is possible to nevertheless import BIP39 seeds into Electrum wallet. Also besides BIp32 there is BIP44 version which some wallet use for the generation of seeds. The amount of protection does a passphrase include? A BIP39 passphrase https://livebookmarking.com/story20605278/dbs-money-value-bip39-github-an-overview-https-dzen-ru-bip39-phrase-com