<p>I'd take a look at this <a href="https://crypto.stackexchange.com/a/86803/36633">answer</a></p>
<p>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.</p>

CC BY-SA 4.0
2021-05-02T13:24:32.713Z
2021-05-02T13:24:32.713Z
Avatar33
<p>128 bit for 11 seed word and 256 for 27 seed word
for 128 bit 1.02 x 10^18 years.</p>

CC BY-SA 4.0
2021-04-30T11:36:06.137Z
I have 12 and 24 word options here.
DaedelusDaemon
CC BY-SA 4.0
2021-04-30T11:45:42.850Z
what is your wallet ?
Mahdi Gh
CC BY-SA 4.0
2021-04-30T11:35:11.970Z
2021-04-30T11:35:11.970Z
Mahdi Gh
<p>How much entropy does BIP39 have?</p>
<p>How long would brute forcing take?</p>
<p>Can a 2nd factor be included on a wallet, to lock, unlock it?</p>

<wallet><bip39><security><randomness>
How much entropy does BIP39 have?
# How much entropy does BIP39 have?

(Asked by: username_0 on 2021-04-30)

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?

**Tags:** wallet, bip39, security, randomness

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## 2 answers

### Answer by username_1 on 2021-05-02. Score: 2 | Accepted answer

I'd take a look at this [answer](https://crypto.stackexchange.com/a/86803/36633)

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.


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### Answer by username_2 on 2021-04-30. Score: 2

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

> **Comments:**
> **username_0**: I have 12 and 24 word options here.  
> **username_2**: what is your wallet ?  

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