bitcoin core on linux | Bitcointalksearch.org

shorena

copper member

Activity: 1498

Merit: 1528

No I dont escrow anymore.

Quote from: DarkStar_ on July 29, 2016, 05:54:56 PM

Quote from: shorena on July 29, 2016, 03:24:19 PM

Quote from: Shiroslullaby on July 29, 2016, 02:54:43 PM

Thanks man. I honestly got scared when it said that my Etherium wallet used a word combination seed.
What is the strength of the seed rated ad? Is it possible to hack the word key?

The seed is 128 bit, so its perfectly fine. Not sure what you mean with hack here, but a brute force attack is not possible no.

A bruteforce attack is possible on the seed. You would have to write a script that downloads a list of words from a dictionary, and tries every combination. It would also check to see if it leads to a wallet with funds. Would be very very hard, and very unlikely that there would be a match. I believe there is 12 (16?) words needed in the seed, and over 10k words that could be used for the seed.

Let me rephrase that: Yes a brute force attack is possible, but not feasible.

Using any dictionary wouldnt make any sense, the dictionary used by electrum is known[1]. With 2048 possible words and 12 selected from that list there are 2048¹² possible seeds, which is actually more than 128 bit (log_2(2048^12) = 132)

[1] https://github.com/spesmilo/electrum/blob/master/lib/wordlist/english.txt

DarkStar_

legendary

Activity: 2772

Merit: 3284

Quote from: shorena on July 29, 2016, 03:24:19 PM

Quote from: Shiroslullaby on July 29, 2016, 02:54:43 PM

Thanks man. I honestly got scared when it said that my Etherium wallet used a word combination seed.
What is the strength of the seed rated ad? Is it possible to hack the word key?

The seed is 128 bit, so its perfectly fine. Not sure what you mean with hack here, but a brute force attack is not possible no.

A bruteforce attack is possible on the seed. You would have to write a script that downloads a list of words from a dictionary, and tries every combination. It would also check to see if it leads to a wallet with funds. Would be very very hard, and very unlikely that there would be a match. I believe there is 12 (16?) words needed in the seed, and over 10k words that could be used for the seed.

shorena

copper member

Activity: 1498

Merit: 1528

No I dont escrow anymore.

Quote from: Shiroslullaby on July 29, 2016, 02:54:43 PM

Thanks man. I honestly got scared when it said that my Etherium wallet used a word combination seed.
What is the strength of the seed rated ad? Is it possible to hack the word key?

The seed is 128 bit, so its perfectly fine. Not sure what you mean with hack here, but a brute force attack is not possible no.

Shiroslullaby

sr. member

Activity: 434

Merit: 250

Thanks man. I honestly got scared when it said that my Etherium wallet used a word combination seed.
What is the strength of the seed rated ad? Is it possible to hack the word key?

achow101

staff

Activity: 3458

Merit: 6793

Just writing some code

Quote from: Shiroslullaby on July 28, 2016, 07:54:36 PM

HD support = Deterministic wallet?
(I've never heard it called this before but I think youre talking about-
"system of deriving keys from a single starting point known as a seed. The seed allows a user to easily back up and restore a wallet without needing any other information and can in some cases allow the creation of public addresses without the knowledge of the private key. "

(From the wiki- https://en.bitcoin.it/wiki/Deterministic_wallet)

HD means Heirarchical Deterministic, so a Deterministic Wallet. The commonly used specification for an HD wallet is BIP32.

Shiroslullaby

sr. member

Activity: 434

Merit: 250

HD support = Deterministic wallet?
(I've never heard it called this before but I think youre talking about-
"system of deriving keys from a single starting point known as a seed. The seed allows a user to easily back up and restore a wallet without needing any other information and can in some cases allow the creation of public addresses without the knowledge of the private key. "

(From the wiki- https://en.bitcoin.it/wiki/Deterministic_wallet)

cr1776

legendary

Activity: 4228

Merit: 1313

Quote from: sandaq on July 28, 2016, 03:46:29 PM

Thank for the answer.

Quote from: LoyceV on July 28, 2016, 03:30:07 PM

Note that making a backup once is NOT enough! By default it contains 100 private keys, once you've used them all it creates new keys, which means you need to make a new backup!

It seems my understanding was faulty. I though it's like for ssh, you have one key and it's used all the time. But now I see that I was wrong.

When do the private keys are being used? is it a key for every transaction?

A nice change for 0.13.0 will be that by default this behavior will change with HD support

achow101

staff

Activity: 3458

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Just writing some code

Quote from: sandaq on July 28, 2016, 03:46:29 PM

Thank for the answer.

Quote from: LoyceV on July 28, 2016, 03:30:07 PM

Note that making a backup once is NOT enough! By default it contains 100 private keys, once you've used them all it creates new keys, which means you need to make a new backup!

It seems my understanding was faulty. I though it's like for ssh, you have one key and it's used all the time. But now I see that I was wrong.

When do the private keys are being used? is it a key for every transaction?

The keys are used for every new address that is made. This is when you get a new receiving address for every time you want someone sends you Bitcoin (you should not reuse addresses). A new address will usually be used when you send as well since there is usually a change address. So you will need to backup every 100 transactions, both receive and send.

sandaq

member

Activity: 72

Merit: 11

Thank for the answer.

Quote from: LoyceV on July 28, 2016, 03:30:07 PM

Note that making a backup once is NOT enough! By default it contains 100 private keys, once you've used them all it creates new keys, which means you need to make a new backup!

It seems my understanding was faulty. I though it's like for ssh, you have one key and it's used all the time. But now I see that I was wrong.

When do the private keys are being used? is it a key for every transaction?

LoyceV

legendary

Activity: 3290

Merit: 16489

Thick-Skinned Gang Leader and Golden Feather 2021

Quote from: sandaq on July 26, 2016, 11:33:36 AM

Where are the keys located?

On my system this file shows where it is:
/home/loyce/.config/Bitcoin/Bitcoin-Qt.conf

Code:

strDataDir=/blockchains/bitcoin

I'm not sure what the default location is, as I've changed it by myself. Most likely your wallet.dat file is located in [homedir]/.bitcoin or something that looks like it.

Note that making a backup once is NOT enough! By default it contains 100 private keys, once you've used them all it creates new keys, which means you need to make a new backup!

achow101

staff

Activity: 3458

Merit: 6793

Just writing some code

Quote from: sandaq on July 26, 2016, 11:33:36 AM

Quote from: achow101 on July 26, 2016, 11:29:25 AM

Quote from: sandaq on July 26, 2016, 10:50:18 AM

I installed bitcoin core on linux and encrypted the wallet, it asked me for a passphrase and I gave it one. Now there's no indication anything is encrypted. I don't see any key in the bitcion directory and when I open the wallet it doesn't ask me for the passphrase.

Is the wallet really encrypted? when will I have to use the passphrase? Where are the keys?

Yes the wallet is encrypted. You will only have to use the passphrase when you need to access the private keys. This only happens when you want to send Bitcoin or sign a message.

Only the private keys are encrypted, not the addresses nor the public keys.

Thanks for the answer.

Where are the keys located? I want to backup them and can't find them.

They are contained in the wallet.dat file. Backup the entire file. You can also, in Bitcoin Core, go to File > Backup Wallet and save the file in a safe location.

sandaq

member

Activity: 72

Merit: 11

Quote from: achow101 on July 26, 2016, 11:29:25 AM

Quote from: sandaq on July 26, 2016, 10:50:18 AM

I installed bitcoin core on linux and encrypted the wallet, it asked me for a passphrase and I gave it one. Now there's no indication anything is encrypted. I don't see any key in the bitcion directory and when I open the wallet it doesn't ask me for the passphrase.

Is the wallet really encrypted? when will I have to use the passphrase? Where are the keys?

Yes the wallet is encrypted. You will only have to use the passphrase when you need to access the private keys. This only happens when you want to send Bitcoin or sign a message.

Only the private keys are encrypted, not the addresses nor the public keys.

Thanks for the answer.

Where are the keys located? I want to backup them and can't find them.

achow101

staff

Activity: 3458

Merit: 6793

Just writing some code

Quote from: sandaq on July 26, 2016, 10:50:18 AM

I installed bitcoin core on linux and encrypted the wallet, it asked me for a passphrase and I gave it one. Now there's no indication anything is encrypted. I don't see any key in the bitcion directory and when I open the wallet it doesn't ask me for the passphrase.

Is the wallet really encrypted? when will I have to use the passphrase? Where are the keys?

Yes the wallet is encrypted. You will only have to use the passphrase when you need to access the private keys. This only happens when you want to send Bitcoin or sign a message.

Only the private keys are encrypted, not the addresses nor the public keys.

sandaq

member

Activity: 72

Merit: 11

I installed bitcoin core on linux and encrypted the wallet, it asked me for a passphrase and I gave it one. Now there's no indication anything is encrypted. I don't see any key in the bitcion directory and when I open the wallet it doesn't ask me for the passphrase.

Is the wallet really encrypted? when will I have to use the passphrase? Where are the keys?

Topic: bitcoin core on linux (Read 1281 times)