<p>you forgot to divide by 2.</p>

<p>7 years is exhaustive, but on average you'd expect it to take 3.5 years to crack.</p>

<p>10^-15 * 46656^5 seconds / 2</p>

CC BY-SA 4.0
2019-01-06T07:31:08.310Z
2019-01-08T07:43:56.257Z
2019-01-08T07:43:56.257Z
Farzher
<p>I want to create a brainwallet using a custom diceware since I don't like the original one. Instead of 7776 words it has 46656 because I use 6 dice for each word instead of 5.</p>

<p>So this is what I got so far, please tell me if I made a mistake:</p>

<p>2 ^ (log2(46656) * 5) / (1 * 10^15) / (60 * 60 * 24 * 365) = 7 years</p>

<ul>
<li>2 ^ (log2(46656) * 5) is the entropy for a brainwallet of 5 words</li>
<li>1 * 10^15 is 1 Phash/s, which is the hashing power I'm assuming for this attacker. I don't even know if this makes sense, because an attacker doesn't need to start over for each brainwallet he wants to crack.</li>
<li>60 * 60 * 24 * 365 represents a year in seconds</li>
</ul>

<brain-wallet>
Trying to calculate the strength of a brainwallet created with a custom diceware
ChocoDeveloper
# Trying to calculate the strength of a brainwallet created with a custom diceware

(Asked by: username_0 on 2014-03-08)

I want to create a brainwallet using a custom diceware since I don't like the original one. Instead of 7776 words it has 46656 because I use 6 dice for each word instead of 5.

So this is what I got so far, please tell me if I made a mistake:

2 ^ (log2(46656) \* 5) / (1 \* 10^15) / (60 \* 60 \* 24 \* 365) = 7 years

* 2 ^ (log2(46656) \* 5) is the entropy for a brainwallet of 5 words
* 1 \* 10^15 is 1 Phash/s, which is the hashing power I'm assuming for this attacker. I don't even know if this makes sense, because an attacker doesn't need to start over for each brainwallet he wants to crack.
* 60 \* 60 \* 24 \* 365 represents a year in seconds

**Tags:** brain-wallet


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## 1 answers

### Answer by username_1 on 2019-01-06. Score: 1

you forgot to divide by 2.

7 years is exhaustive, but on average you'd expect it to take 3.5 years to crack.

10^-15 \* 46656^5 seconds / 2


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