Trezor One Bip39 Default variety of iterations used in wallets is 2048. Raising this number must enable it to be safer in opposition to brute pressure assaults, having said that you'll need to shop this worth. To obtain your wallet with customized PBKDF2 you'll want to use this script (or https://funbookmarking.com/story18575485/what-is-bip39-passphrase-seed-phrase-generator-no-further-a-mystery