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How unlikely it is to guess a Seed Phrase (12 vs 24 words)

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How unlikely it is to guess a Seed Phrase (12 vs 24 words)

Warning, contains math!

Repetition

What's the probability of NOT throwing a 6 with a die?

https://preview.redd.it/ufl8x21vuvo91.png?368&format=png&auto=webp&s=2c6f7e6e20c0a3190762bd389708786e9519b07b

What's the probabiltiy NOT throwing a 6 with a die 10 times in a row?

https://preview.redd.it/0dtjdl8guvo91.png?568&format=png&auto=webp&s=3e76b49752a3f4c309488dfe5ce575cf139ac016

Seed with 12 words

We get 12 words out of a list of 2048. This gives us 2048^12 different theoretically possible seed phrases.

The probability of failing to guess the correct seed phrase is:

https://preview.redd.it/yio6zry0uvo91.png?87&format=png&auto=webp&s=3f3c1a28651683223ce44c7c90521164c56a34e6

There's only 1 correct seed phrase, so we get (2048^12)-1 possibilities to not guess it. This is the result:

The chance of not guessing the right seed is 99.99999999999999999999999999999999999998 % (that's 37 nines after the point)

Pretty much elusive.

Let's use a CPU for a year (hypothetically)

My CPU has 16 cores that can run 32 parallel threads to guess seeds. Using private keys I got 350,000 keys per second when trying to guess 152,000 random addresses from a list (Python project). This is the math for guessing seeds using my CPU 24/7 for a whole year:

https://preview.redd.it/3cpl342swvo91.png?243&format=png&auto=webp&s=b5e659334aa671e3322568ca200187c3949392c8

Just like we rolled the dice 10 times we now do this 350k*150k*.... times. 60 seconds, 60 minutes, 24 hours, 365 days. This is the result:

The chance of not guessing the right seed is 99.99999999999999999997 % (still 19 nines after the point!)

Okay, 1,000,000 years then

Not surprisingly the number of nines was reduced by 6: 99.99999999999997%

Still absurdly unlikely and not worth the energy. Also I would be dead after 0.004% of that time span.

1 year of crunching against 24-word Seed

99.999999999999999999999999999999999999999999999999999999999994 %

57 numbers after the point! This corresponds to roughly the same probability as guessing a private key with 256 Bit!

/edit: Math was done with wolframalpha.com because crypto is too strong even for a scientific calculator

submitted by /u/ismirschlecht
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