Do you think it's safe to use a private key hash from 12-characters - page 2.

Findingnemo

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Quote from: doyouthinkitisOK on August 07, 2023, 08:26:21 PM

Do you think it's safe to use a private key hash from 12-characters

No, it is not, and if I am not wrong it can be cracked in a few minutes.

If 12 characters in the key, the total number of combinations is 16^12.

16^12 = 18,446,744,073,709,551,616

Comparing it with 256 bits entropy or 64 hexadecimal characters then the total number of combinations is 16^64.

16^64 = 115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,936

And it will take at least a century to brute force this possibility even with powerful computation power.

odolvlobo

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Quote from: doyouthinkitisOK on August 07, 2023, 08:26:21 PM

Do you think it's safe to use a private key hash from 12-characters

Assuming that the 12-character string is generated randomly and the range for each character is [0-9][a-z][A-Z], Then, the number of possible keys is 62¹², or approximately 2^71.5, so you have only 71.5 bits of entropy.

In my non-expert opinion, it is not safe for a private key.

pooya87

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You have to figure out what the size of your "entropy" is. If it is at least 128 bits, then it is secure regardless of the hash algorithm you use (a simple SHA256 would suffice). Otherwise if it is lower, your security is going down too.
So how many bits does each of your characters represent?

ranochigo

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Depends, how big is your key space and how are you generating it? If it is generated in a manner that is completely random and you're including all of the alphabets (both capitalized and non-capitalized) with all of the numbers, then you might possibly be safe. Given the correct criteria, I would think that so long as a good key stretching function (think Scrypt, and salted) that is sufficiently strong and slow is used, it should be safe.

However, note that this isn't exactly recommended because there are still various points of failure involved. You are better off using one of the wallets to generate a seed instead.

doyouthinkitisOK

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Do you think it's safe to use a private key hash from 12-characters

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