Bip39 Length Default number of iterations used in wallets is 2048. Rising this amount must enable it to be more secure versus brute force attacks, on the other hand you'll need to store this value. To accessibility your wallet with personalized PBKDF2 you'll want to use this script (or similar) https://followbookmarks.com/story18680428/12-word-seed-phrase-generator-github-considerations-to-know-about-seed-phrase-generator