Bip39 Bitcoin Improvement Proposal 39 Default variety of iterations used in wallets is 2048. Raising this range need to allow it to be more secure from brute force attacks, however you will need to retailer this price. To accessibility your wallet with custom PBKDF2 you must use this script (or https://esocialmall.com/story4002969/scure-bip39-npm-bip39-word-list-secrets