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e4xit
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September 05, 2013, 09:39:26 AM
 #21

Perhaps you should also go to this website https://www.grc.com/haystack.htm and input a password of the same length and character type (although not obviously your exact password) into the box to see somerought stats on how difficult it is to be brute-forced. Not too difficult I would imagine, and now remember that some in this community will have GPU farms not mining much BTC anymore, which could possibly earn more in more 'malicious' ways...
Those estimates are usually worthless.

The encryption in bitcoin-qt's wallet uses powerful strengthening— on your own system it won't be able to test more than 10 attempts per second... even with a powerful GPU farm things will be limited.

(as compared to BC.i wallets, for example, which has gpu cracking tools that do millions of attempts per second)

That isn't to say that having a good key is important— it is... but for many people the strengthening is enough that the bigger risk is losing/forgetting the keys.


I know nothing about this really, apart from what I have read on the interwebs, but I would be worried that there might be a (custom?) other program/software which could be used to decrypt the wallet file faster than Bitcoin-Qt? Or is the slow cracking speed simply a result of the encryption protocol used?

If you don't have the private key for "your" bitcoins then you have no bitcoins.
There are a million bits in a bitcoin: 1 ฿ = 1,000,000 ƀ
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September 05, 2013, 01:30:06 PM
 #22

I know nothing about this really, apart from what I have read on the interwebs, but I would be worried that there might be a (custom?) other program/software which could be used to decrypt the wallet file faster than Bitcoin-Qt? Or is the slow cracking speed simply a result of the encryption protocol used?
No, the process used is very computationally intensive and there are no shortcuts. If you wish to learn more, search "key stretching" on Wikipedia.

It is pitch black. You are likely to be eaten by a grue.

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September 10, 2013, 06:38:03 PM
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If you're going to do more testing on encrypted wallets on 0.8.3 vs. 0.8.4, why not do the testing on testnet? Make a new testnet wallet on 0.8.3, encrypt, upgrade, and see if you can decrypt? Don't play with real coins for something like this.
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September 11, 2013, 01:04:44 AM
 #24

Just keep a backup of the previous bitcoin-QT version and your wallet. Very easy to do. Some people tend to keep several backups of wallets every day, and backups of bitcoin-QT for the last 10 versions. (I just keep the last 1 or 2.)

@grue, does the stretching feature of the current bitcoin-QT wallet change depending on your own computer's processing power? If I have a single core 1 GHz laptop, it picks a smaller "stretch" than if I had a octa-core 5 GHz i Xeon whatever?

Does it depend change on the speed and/or cores?

If it does, wouldn't it be better to create the wallet on a fast machine, encrypt it, then transfer it to your regular usage slower machine? It will then take longer to use and open by a second or two.

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