Quote from: PrimeNumber7 on July 09, 2019, 07:27:48 AM

Quote from: marko10921 on July 09, 2019, 01:30:34 AM

For example when an electrum wallet is crypted we got the following:

2 + 3 = X, we know that x is 5 cause we know the first 2 numbers, same with electrum when doing encryption:

unencrtyped_wallet + password_encryption = X,

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but in this case we got something like this:

2 + X = 5, we can also find X because X = 5 - 2

same should be applicable to my situation:

unecrypted_wallet + X = encrypted_wallet

It would be more accurate to describe the decryption key (the password) as being on a 3-dimential plane. In your example, you can determine the solution to "X" however you do not know where on the "Z" plane the solution is, and there is an unlimited number of places on the Z axis the solution could be. Even having multiple plaintext sets will not help you.

I am going to speculate you are in a position that can be described as below:
You have an electrum wallet ("Wallet 1") that you do not have the password to
You have a second electrum wallet ("Wallet 2") that you know has the same password as Wallet 1
You have a decrypted copy of Wallet 2, possible from an old backup.
Wallet 1 has a lot of coin in it

Depending on how complex your password is, and how much you know about your password, you may be able to brute force the password via automated means. There are a number of software programs and service providers that can try to guess your password, and know if it figures it out.

For example, if you know your password is 10 digits, and is a combination of uppercase, lowercase letters and numbers that are something close to "random" there are a 8.39 * 10¹⁷ possibilities of what your password could be. However if you know your password starts with the uppercase letter "P" followed by 9 numbers that are something close to random, the number of possibilities drops to 1 * 10⁸.

You are a smart guy, and the first to understand the situation presented.

1.
I have wallet1, where seed and xprv are both encrypted with strong password, I can see the balance and it's gianormous by anyone's standards. Wallet1 cannot be cracked by nothing, dictionary and bruteforce are out of the question. Possibly bruteforce, but length of password is unknown, and I'd like to be realistic and not go that route which will lead to alot of time wasted and eventual disapointment.
2.
I have wallet 2, unecrypted and encrypted, password for encryption unknown, but 99% chance to match the one at wallet1 as it was set up by the same entity. This in my mind was the best shot I had at getting the password for wallet1 as I supposed I could reverse the equation in some way unknown to me till I started this topic. Apparently this is categorized as an attack and a serious breach if it was possible, so right now I am pretty much content with the situation unless something else comes up. I am doing pretty well in life, I am heavily invested in BTC and also an early adopter, but the amount present in wallet1 is enough motivation for anyone to try and do something about it, no matter the cost.