3

How much entropy does BIP39 have?

How long would brute forcing take?

Can a 2nd factor be included on a wallet, to lock, unlock it?

2

I'd take a look at this answer

It seems a very well resourced attacker would be able to find a used private key for 128bit seed. This would be an attack on all keys in the network, not yours specifically. For 256bit seed, it should be infeasible.

2

128 bit for 11 seed word and 256 for 27 seed word for 128 bit 1.02 x 10^18 years.

2
  • I have 12 and 24 word options here. Apr 30 '21 at 11:36
  • what is your wallet ?
    – Mahdi Gh
    Apr 30 '21 at 11:45
0

You should know that if you generate a wallet with the help of cardano-wallet utility you will be proposed two options: general-factor 24-word seed (2048²⁴ or 2²⁶⁴ possible combinations) and optional second-factor 12-word seed (2048¹² or 2¹³² possible combinations).

That's a real nightmare for a hacker because it's practically impossible to brute force it.

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