Bip39 Rust Wallet software package that put into practice BIP39 only use 2048 iterations being a norm. Increasing this parameter will improve safety versus brute power attack, but you have got to retail store this new parameter. Use non-public keys at brainwallet.org, but be careful - it could be easy https://directory-store.com/listings13012334/bip39-js-cdn-bip39-phrase-secrets