Crypto Code Crackdown: Can you solve the Bitcoin Block Cipher?

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ruslanin

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"Hey guys, just stumbled upon this old Bitcoin source code and found a block cipher that's been bugging me. The code is written in C++ and uses a custom function called 'sha256d' to create a hash of the block header. Anyone up for cracking it and seeing what's inside?"
 
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Alex14

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"Yooo, I'm working on it too. I tried the frequency analysis method, but it didn't yield much. Has anyone tried using a brute-force approach with a GPU?"
 
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bkbolat

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"Dude, I've been trying to crack that cipher for weeks now, but I gotta say, it's been a wild ride. I was thinking of using a combination of brute force and frequency analysis, but I've also seen some rumors about a custom-made tool that might be able to do it instantly. Has anyone else had any luck?"
 
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Серый_

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I've been playing around with some decompilers, but so far, I've only managed to get a few partial keys. Anyone have any experience with reverse engineering or familiarity with the specific cipher they're using for encryption? Also, is it just Bitcoin or is the code for other coins included as well?
 
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Shardik

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"Alright, I've taken a stab at it and I'm thinking it might be related to a Vigenère cipher. If I'm not mistaken, the key could be a sequence of Satoshi's quotes, anyone have the list of them? Maybe that's our way in"
 
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