Does BIP39 allow for the same word to be generated more than twice in a seed?

[hosseinimr93]

It's even possible that you generate a 24 word seed phrase and a single word is repeated 24 times.

Nope, that's not (realistically) possible. It would be more likely to generate someone else's seed phrase, than randomly ending up with 24 times the same word. It's just not going to happen.

You are right. That's practically impossible. That's why I said "The probability of a single word is repeated n times decreases exponentially with increase in n and that's why it's unlikely that you generate a seed phrase in which a single word is repeated 3 times, but as I said that's possible."

It's unlikely that the same word is repeated 3 times, let alone 24 times.

My point was that there is no rule preventing a word from being repeated multiple times and even if the same word is repeated 24 times, the seed phrase may be valid. Maybe, my wording wasn't good.

[1714526151]

1714526151

[1714526151]

1714526151

[1714526151]

1714526151

[1714526151]

1714526151

[LoyceV]

Maybe, my wording wasn't good.

No worries I like pointing out that "extremely unlikely" doesn't mean "it's still possible".

So you're telling me there's a chance

[philipma1957]

why would brute force do it so quickly?

if it is true brute force

and you have say 1500 word repeated 23 times.

There are hundreds of bots out there monitoring millions of easily hacked addresses waiting to sweep deposits the instant they show up. We've seen it countless times with brain wallets. Brain wallets generated from easy to guess phrases, such as common words, phrases, quotes, lyrics, etc., have any funds sent to the derived addresses stolen in under a second. These same bots are almost certainly also watching the addresses from any and all publicly revealed seed phrases, and any weak seed phrases, such as the same word repeated 23 times.

This is of course completely separate to a seed phrase including the same word twice or even three times, and these seed phrases are no easier to brute force than any other randomly generated seed phrases.

But that is not brute force that is more like social engineering. Which would be a bit different. It is more like using

000
111
222
333
444
555
666
777
888
999
123. as your first attempts on a 3 digit combo in the hope the programmer was lazy

btw if it works why not.


I do agree  don't use 1 word 23 times as someone could simply try 1 million seeds that appear common .

[apogio]

I do agree  don't use 1 word 23 times as someone could simply try 1 million seeds that appear common .

In fact I randomly tested some phrases with 23 same words and their corresponding checksum. Most of them had transaction history, which means they have been used even as a joke.

[odolvlobo]

This is a valid bip-39 phrase.

Code:

abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon art

It is derived from an entropy value of 0.