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Topic: Collection of 18.509 found and used Brainwallets - page 3. (Read 31239 times)

legendary
Activity: 3290
Merit: 16489
Thick-Skinned Gang Leader and Golden Feather 2021
How is someone supposed to remember the exact number of hashing rounds? I think in both the WarpWallet and your proposed ~1.2 million rounds of hashing implementations, you will need to either document the rounds of hashing,  or rely on a third party to help calculate the private key, and I don't think this meets the definition of a brain wallet.
With WarpWallet you can (and should!) keep your own offline copy.
If you're going for a "weird" number of hashing rounds, I can think of many ways to remember the number. It could be your phone number or full date of birth. Or just something you remember. Worst-case, if you forget the exact number, you can still brute-force it yourself given that you know the pass phrase.
copper member
Activity: 1666
Merit: 1901
Amazon Prime Member #7
I'm pretty sure people still use them. Even better if they use something they use much heavier encryption (such as WarpWallet).
The idea of simply remembering your money is appealing to me (but I don't dare risk it for a large amount).
What I don't understand is why don't they use the hash function millions of times to make their brain wallet even more secure?
I'm pretty sure some people do that. And I'm pretty sure some others are searching for it too.

But isn't that what WarpWallet was created for? 524,288 times scrypt, followed by 65,536 times pbkdf2. A simple manual "brute-force" tells me that "satoshi" was used to deposit 0.0003 BTC in 2015. It wasn't moved out instantly (only after 7 blocks).
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The scope of realistic brain wallets is very small when compared to all potential private keys. Requiring an adversary to do a million times more work might sound like a lot, but compared to all potential private keys, it really is not.
If you're the only one who uses 1,276,816 rounds of hashing, the number of potential wallets that can be found is limited to only your wallets, versus many different wallets that all use only one round.
How is someone supposed to remember the exact number of hashing rounds? I think in both the WarpWallet and your proposed ~1.2 million rounds of hashing implementations, you will need to either document the rounds of hashing,  or rely on a third party to help calculate the private key, and I don't think this meets the definition of a brain wallet.
legendary
Activity: 3290
Merit: 16489
Thick-Skinned Gang Leader and Golden Feather 2021
I'm pretty sure people still use them. Even better if they use something they use much heavier encryption (such as WarpWallet).
The idea of simply remembering your money is appealing to me (but I don't dare risk it for a large amount).
What I don't understand is why don't they use the hash function millions of times to make their brain wallet even more secure?
I'm pretty sure some people do that. And I'm pretty sure some others are searching for it too.

But isn't that what WarpWallet was created for? 524,288 times scrypt, followed by 65,536 times pbkdf2. A simple manual "brute-force" tells me that "satoshi" was used to deposit 0.0003 BTC in 2015. It wasn't moved out instantly (only after 7 blocks).
If you use a decent password, and your email as salt, it's much more secure than regular brainwallets. My own (very inaccurate) estimate: a million times more secure because of the heavy encryption, and another factor one million because of the email address that makes it impossible to brute-force everyone's wallet at once.

Honestly speaking, I have asked Loyce to prepare list of tx ids and launched search on that. The result is surprising! (I mean it is surprising how many wallets were using that method). Each of that values generates address which was used in the past.
The first one I checked lost 7.72 BTC in 2014 (back then valued at almost $3k).

The scope of realistic brain wallets is very small when compared to all potential private keys. Requiring an adversary to do a million times more work might sound like a lot, but compared to all potential private keys, it really is not.
If you're the only one who uses 1,276,816 rounds of hashing, the number of potential wallets that can be found is limited to only your wallets, versus many different wallets that all use only one round.
legendary
Activity: 3472
Merit: 10611
It's outdated currently that we have standards such as BIP39, but it might wasn't a bad idea to create a secure brainwallet if the other choice was to keep a wallet.dat secure.
These two are not comparable though and BIP39 wasn't a replacement. That's because the brainwallet is a "human memorizable string" while BIP39 is a "human readable string", or in other words you are not supposed to memorize your mnemonic but you are supposed to memorize your brainwallet.
legendary
Activity: 1890
Merit: 1058
Vave.com - Crypto Casino
Hi,

As been discussed many times before using a Brainwallet is a bad idea. I ran some test myself and found 18.509 BTC-addresses based on a brainwallet which also has been used in the blockchain before.

I tried to compare my results with the results of other researchers but could not find any lists online at all. I found some examples but not a comprehensive list. So I published my own results over here: https://eli5.eu/brainwallet

Please note: all published addresses have a balance of 0 so this is not a list for robbers Smiley. There are also a lot of extra datasets I haven't used this far so I expect the numbers to go up once I use them as well (I'm in the middle of perfecting my own tooling and blockchain parser so this will take some more time first).

I love to get some feedback and if you have results to share which I missed in this round I'm more than happy to hear from you and include them.

TA

ahahaha wow so whats the public address ?
copper member
Activity: 1666
Merit: 1901
Amazon Prime Member #7
Dont do this. Hashing a pass phrase will not result in additional entropy. If an adversary were to know that you hashed a brain wallet pass phrase, they could do the same to brain wallet candidate pass phrases they believe you are likely to use.
It does the same harm it does for an attacker to know that my password is 18 characters long. It lowers my security, but it's infeasible to break it if chosen properly. Same happens with more hashes; if an adversary knew that I'm hashing a million times, he'd need a million times his computational power to do the same work.
The scope of realistic brain wallets is very small when compared to all potential private keys. Requiring an adversary to do a million times more work might sound like a lot, but compared to all potential private keys, it really is not.
legendary
Activity: 1512
Merit: 7340
Farewell, Leo
Dont do this. Hashing a pass phrase will not result in additional entropy. If an adversary were to know that you hashed a brain wallet pass phrase, they could do the same to brain wallet candidate pass phrases they believe you are likely to use.
It does the same harm it does for an attacker to know that my password is 18 characters long. It lowers my security, but it's infeasible to break it if chosen properly. Same happens with more hashes; if an adversary knew that I'm hashing a million times, he'd need a million times his computational power to do the same work.
copper member
Activity: 1666
Merit: 1901
Amazon Prime Member #7
I'm pretty sure people still use them. Even better if they use something they use much heavier encryption (such as WarpWallet).
The idea of simply remembering your money is appealing to me (but I don't dare risk it for a large amount).
What I don't understand is why don't they use the hash function millions of times to make their brain wallet even more secure? We all know that just hashing a subjectively difficult passphrase isn't as much secure as it is to generate an entropy randomly. There wouldn't be such thread if brain wallet users hashed more than once, because, apparently, some passphrases aren't as strong as they thought.
Dont do this. Hashing a pass phrase will not result in additional entropy. If an adversary were to know that you hashed a brain wallet pass phrase, they could do the same to brain wallet candidate pass phrases they believe you are likely to use.
legendary
Activity: 1512
Merit: 7340
Farewell, Leo
It has to do with the time consumption.
Sure, you don't want to wait for 10-15 minutes? Wait a few seconds to do a few thousands hashes. You can't seriously trade security for a few seconds.

And considering that brainwallets that I've seen are browser based they are even more limited to the amount of computing power they can use so the process could be even slower than it could be.
Browser-based wallets are generally 🚩🚩🚩

Some tried to replace SHA256 with stronger algorithms such as scrypt but such projects don't gain any popularity since the idea of brainwallet itself is flawed.
It's outdated currently that we have standards such as BIP39, but it might wasn't a bad idea to create a secure brainwallet if the other choice was to keep a wallet.dat secure.

We may imagine that you want to launch hash function 20220807 times - and even if you forget that number but you remember period of time when the wallet was created, there is still way to restore it.
If you remember the passphrase, there's no problem. Just hash the hash, until you find the proper hash.
hero member
Activity: 714
Merit: 1010
Crypto Swap Exchange
Seriously, how stupid is someone to use SHA256("")

More likely to be a programming error. I recall suggesting a few years ago in this thread that something like (pseudoish code) assert(key != 0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855) would have avoided this particular issue.

Maybe a few of them might have been some programming errors, but I doubt that for the majority of funding transactions for this private key. Many are probing or dusting, but why should there be such a lot of wacky programming?
About the half of the total transactions are funding, the other half is stealing the coins as of now, today. Ridiculous game...

Public addressNumber of Tx Private key type
1HZwkjkeaoZfTSaJxDw6aKkxp45agDiEzN
717
copper member
Activity: 76
Merit: 11
~ as "All of the information required to reconstruct the private key is published on the blockchain". But it was not as easy ;-)

Maybe also valid for Satoshi's mined blocks?

~
We can visualize with the blockchain data, how satoshi Mine his coins:

legendary
Activity: 952
Merit: 1386
What I don't understand is why don't they use the hash function millions of times to make their brain wallet even more secure? We all know that just hashing a subjectively difficult passphrase isn't as much secure as it is to generate an entropy randomly. There wouldn't be such thread if brain wallet users hashed more than once, because, apparently, some passphrases aren't as strong as they thought.

Because it is not kind of "standard". If at this moment you have an idea to create a new wallet using a given phrase, you have software to do it quickly. I am not aware of any program which would accept other parameters, like number of iterations.
We may imagine that you want to launch hash function 20220807 times - and even if you forget that number but you remember period of time when the wallet was created, there is still way to restore it.

Seriously, how stupid is someone to use SHA256("") or SHA256 of any publicly available data, block hashes included, as private key and believe this is in any way "smart"?

Honestly speaking, I have asked Loyce to prepare list of tx ids and launched search on that. The result is surprising! (I mean it is surprising how many wallets were using that method). Each of that values generates address which was used in the past.
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It was my try to solve Lauda Memorial Puzzle, as "All of the information required to reconstruct the private key is published on the blockchain". But it was not as easy ;-)


legendary
Activity: 3472
Merit: 10611
What I don't understand is why don't they use the hash function millions of times to make their brain wallet even more secure?
It has to do with the time consumption. When the user enters a password they want to get their address as soon as possible, if you increase the number of hashes it would consume more time hence ruins user experience. And considering that brainwallets that I've seen are browser based they are even more limited to the amount of computing power they can use so the process could be even slower than it could be.

Besides, brainwallets aren't serious projects and weren't designed for security at first. Some tried to replace SHA256 with stronger algorithms such as scrypt but such projects don't gain any popularity since the idea of brainwallet itself is flawed.
legendary
Activity: 1512
Merit: 7340
Farewell, Leo
I'm pretty sure people still use them. Even better if they use something they use much heavier encryption (such as WarpWallet).
The idea of simply remembering your money is appealing to me (but I don't dare risk it for a large amount).
What I don't understand is why don't they use the hash function millions of times to make their brain wallet even more secure? We all know that just hashing a subjectively difficult passphrase isn't as much secure as it is to generate an entropy randomly. There wouldn't be such thread if brain wallet users hashed more than once, because, apparently, some passphrases aren't as strong as they thought.
legendary
Activity: 3290
Merit: 16489
Thick-Skinned Gang Leader and Golden Feather 2021
I came across my simple mini key generator tonight, and I'm having another play with it.

The naive version uses random() and outputs about 8000 valid keys per second on a single core of an i7-3960X.
I did that for a while a couple of years back (with a python generator), trying to create vanity addresses with mini private key, but I had to search through large output files and the output was far too slow to find anything meaningful.

One thing is sure in my opinion - brain wallets belongs to past.
I'm pretty sure people still use them. Even better if they use something they use much heavier encryption (such as WarpWallet).
The idea of simply remembering your money is appealing to me (but I don't dare risk it for a large amount).
legendary
Activity: 2268
Merit: 1092
Seriously, how stupid is someone to use SHA256("")

More likely to be a programming error. I recall suggesting a few years ago in this thread that something like (pseudoish code) assert(key != 0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855) would have avoided this particular issue.
hero member
Activity: 714
Merit: 1010
Crypto Swap Exchange
So true. It's rare to see such large amounts get likely lost to those "snatchers". On 2022-07-27 some (not so smart) entity sent 0.9BTC to the "empty string" brainwallet in block 746835 (tx 37e166a1e52e96bcfe535738082e328ef8db56aafd6945d9cad6f2afdb34b4a4) which was very likely claimed by some of those bots who constantly monitor mempool transactions for such brainwallet transactions.

Seriously, how stupid is someone to use SHA256("") or SHA256 of any publicly available data, block hashes included, as private key and believe this is in any way "smart"?
copper member
Activity: 1666
Merit: 1901
Amazon Prime Member #7
The fact that the private key is derived using SHA-256 does not make it a brain wallet. A HD wallet seed comes from the SHA-512 hash of the BIP-39 seed phrase. Does that make an HD wallet a brain wallet? A brain wallet is derived from something that can be memorized. That is why it is called a "brain" wallet. The mini-key is a random sequence and is not intended to be memorized so it is not basically a SHA-256 brain wallet.

What about "my private key is generated from 111th block's hash in bitcoin blockchain"? You do not remember exact value which is used to produce private key, but you remember the way how to find it - exactly like "my phrase is second verse of song X".
One thing is sure in my opinion - brain wallets belongs to past.
Using a private key that is derived from in a similar manner is very risky, and is very likely to result in tears. There are many people who are monitoring a large scope of potential addresses for transactions being sent to them, and some of these people look to bitcoin-related forums to increase the scope of these addresses. You can call it a brain wallet if you want, but my advice is to not do it.
legendary
Activity: 952
Merit: 1386
The fact that the private key is derived using SHA-256 does not make it a brain wallet. A HD wallet seed comes from the SHA-512 hash of the BIP-39 seed phrase. Does that make an HD wallet a brain wallet? A brain wallet is derived from something that can be memorized. That is why it is called a "brain" wallet. The mini-key is a random sequence and is not intended to be memorized so it is not basically a SHA-256 brain wallet.

What about "my private key is generated from 111th block's hash in bitcoin blockchain"? You do not remember exact value which is used to produce private key, but you remember the way how to find it - exactly like "my phrase is second verse of song X".
One thing is sure in my opinion - brain wallets belongs to past.
copper member
Activity: 1666
Merit: 1901
Amazon Prime Member #7
I thought the mini private key format, used for Casascius physical bitcoins should rate a mention here, because it's basically a SHA256 brainwallet... but with a randomly generated passphrase.

https://en.bitcoin.it/wiki/Mini_private_key_format

Given that the random passphrase length is 22 characters (early version) or 30 characters, the chances of brute forcing it are still virtually nil, but technically, it is less secure than a standard key, in particular because 99%+ of the tries can be discarded after the first SHA256 hash.

I came across my simple mini key generator tonight, and I'm having another play with it.

The naive version uses random() and outputs about 8000 valid keys per second on a single core of an i7-3960X.

I updated it to use the xoshiro256** PRNG, and the speed increases to around 13000 valid keys per second.

Because the generation process requires that the first byte of the candidate hash be '00', on average only 1/256 candidates will be valid, so it's really testing about 3.3 million keys per second.

It's still a massive search space (58^30?), even for a SHA256 brainwallet, and prematurely discarding 255 out of 256 candidates does not reduce the search space... it just makes searching faster. Plus, how many Casascius coins were ever created, and how many would still be funded? So this is really just a curiosity.

The reason why brain wallets are insecure is that they are typically generated in ways that are not truly random. Generating a brain wallet using a random function will not have this problem.

For example, if a brain wallet is a phrase that is found in literature, there are a very limited number of phrases in literature, and the number of candidate brain wallets are many orders of magnitude less than the number of potential private keys.
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