Bip39 Add Private Key Wallet application that carry out BIP39 only use 2048 iterations as a norm. Growing this parameter will improve security against brute force attack, but you will need to store this new parameter. I failed to get involved in Bitcoin to generate an inefficient PayPal clone - https://webdirectorytalk.com/listings512684/bip39-seed-phrase-generator-not-known-factual-statements-about-bip39-phrase