Bip39 Encryption Though it works by using BIP32 method it is possible to however import BIP39 seeds into Electrum wallet. Also aside from BIp32 There may be BIP44 version which some wallet use for your generation of seeds. You may see the entire source code in standalone, offline html file. https://bookmarkity.com/story18669174/bitcoin-seed-phrase-generator-with-balance-the-single-best-strategy-to-use-for-seed-phrase-generator