Bip39 Docs Default variety of iterations used in wallets is 2048. Increasing this quantity really should make it safer towards brute power assaults, having said that you'll have to keep this benefit. To obtain your wallet with custom made PBKDF2 it is best to use this script (or similar) to https://prbookmarkingwebsites.com/story21522420/bip39-swift-seed-phrase-generator-no-further-a-mystery