Bip39 Example. The only real reason People letters are listed is to really make it easier for our human brains to browse them and possibly memorize our recovery phrase. Passphrase values are stored during the /.tmp.tmp file around the MicroSD card. The values are encrypted with AES-256 (CTR manner) using https://trentoncmxir.wikibriefing.com/3006566/the_anatomy_of_a_bip39_phrase_entropy_phrases_and_security