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Author Topic: [ANNOUNCE] Electrum - Lightweight Bitcoin Client  (Read 243656 times)
SebastianJu
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June 19, 2015, 09:25:55 PM
 #1761

When you create a csv with the private keys, will you risk your whole wallet when you give a couple of these addresses, or their private keys, to another person? Could he guess or otherwise get to my other addresses and private keys? If so, why doesnt electrum simply create a single private key then?

I ask because of pos coins, like clams and their initial distribution. Some users import their clams into just-dice.com, by sending a command to the chat window.

 

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June 19, 2015, 09:40:27 PM
 #1762

When you create a csv with the private keys, will you risk your whole wallet when you give a couple of these addresses, or their private keys, to another person? Could he guess or otherwise get to my other addresses and private keys?

Maybe.

Anyone who has a single private key and your master public key (from the same wallet) can compute the wallet's master private key (and therefore all of the other private keys). Keep in mind that your master public key is not encrypted in your wallet file, so gaining access to it is easier than gaining access to the encrypted master private key stored in your wallet file.

If all one has is a set of private keys from the same Electrum wallet, they cannot determine any other private keys.

Personally, I'd never give anyone any of my private keys unless they were from an isolated wallet I didn't use for any other purpose (which I'd then consider compromised for all intents and purposes).
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June 19, 2015, 09:43:33 PM
 #1763

No every address has its own private key and as far as i know they cannot be linked to other wallet in any way.

About the clams claiming trough just-dice.com. It is just plain stupid if you do that. I find it even tricky to do it trough the wallet. But only address which are filled at the time they get funded got their CLAMS and that was last year ago. Just send your btc's to a wallet which do not have unclaimed CLAMS before you claim your CLAMS.

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June 19, 2015, 09:46:43 PM
 #1764

No every address has its own private key and as far as i know they cannot be linked to other wallet in any way.

Please see the post I wrote a few minutes ago just above yours....
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June 20, 2015, 11:38:55 AM
 #1765

Personally, I'd never give anyone any of my private keys unless they were from an isolated wallet I didn't use for any other purpose (which I'd then consider compromised for all intents and purposes).

Why do you consider it a risk to give out a single private key for a single address when you say its not risking the other addresses? Electrum wont use an already used addres out of its own. And new addresses should be safe.

No every address has its own private key and as far as i know they cannot be linked to other wallet in any way.

About the clams claiming trough just-dice.com. It is just plain stupid if you do that. I find it even tricky to do it trough the wallet. But only address which are filled at the time they get funded got their CLAMS and that was last year ago. Just send your btc's to a wallet which do not have unclaimed CLAMS before you claim your CLAMS.

I claimed then through just dice. It took some time because electrum isnt made for it but i found 6 + 10 addresses containing clams. I then imported these single private keys into jd. When youre right and the other addresses arent compromised then it should not be a problem isnt it?

Or do you speak about the amount of work? Yes, thats no fun but i wondered and though i should have a couple one. I think i found more than i awaited.

The wallets arent really used anymore but i still wonder why you still see a risk.

 

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btchris
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June 20, 2015, 12:24:24 PM
 #1766

Personally, I'd never give anyone any of my private keys unless they were from an isolated wallet I didn't use for any other purpose (which I'd then consider compromised for all intents and purposes).

Why do you consider it a risk to give out a single private key for a single address when you say its not risking the other addresses? Electrum wont use an already used addres out of its own. And new addresses should be safe.

"Risk" is exactly the right word. As I said, once someone has a single private key, they only need to get your master public key to compromise the rest of your wallet. Your master public key is stored in you wallet file unencrypted, so it's not that hard to get.

If you're comfortable there's no way an adversary could gain access to your master public key, then you're probably safe, but it remains risky....

(Note that if you decide to take this risk and give out a single private key, there's no additional risk to giving out more private keys to the same adversary.)
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June 20, 2015, 02:19:17 PM
 #1767

Personally, I'd never give anyone any of my private keys unless they were from an isolated wallet I didn't use for any other purpose (which I'd then consider compromised for all intents and purposes).

Why do you consider it a risk to give out a single private key for a single address when you say its not risking the other addresses? Electrum wont use an already used addres out of its own. And new addresses should be safe.

"Risk" is exactly the right word. As I said, once someone has a single private key, they only need to get your master public key to compromise the rest of your wallet. Your master public key is stored in you wallet file unencrypted, so it's not that hard to get.

If you're comfortable there's no way an adversary could gain access to your master public key, then you're probably safe, but it remains risky....

(Note that if you decide to take this risk and give out a single private key, there's no additional risk to giving out more private keys to the same adversary.)

Oo Why is electrum storing the master public key unencrypted? I would assume that, when i encrypt electrum, that everything is encrypted that could mean a risk.

I anyway planned to change my wallets, it can be done fast with electrum so i think ill do so instantly. I dont think there is a big risk that someone will get it... my wallets are practically empty anyway.

 

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btchris
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June 20, 2015, 05:35:04 PM
 #1768

Oo Why is electrum storing the master public key unencrypted? I would assume that, when i encrypt electrum, that everything is encrypted that could mean a risk.

It's an ease-of-use trade-off. Because it's unencrypted, you don't need to type in your password if all you want to do is check your balance or generate a new receive address. (Of course, all of your private keys are encrypted when you set a password.)
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June 20, 2015, 08:57:17 PM
 #1769

I would prefer the MPK to be encrypted and a password prompt shown upon opening Electrum. I think Mycelium does this now?

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June 20, 2015, 09:08:07 PM
 #1770

I would prefer the MPK to be encrypted and a password prompt shown upon opening Electrum. I think Mycelium does this now?

I would second that. I never thought about that till now. My wallet is private and when its encrypted then it should mean no one can see inside, except me. At the moment everyone who has access to my pc, which is in fact no one but still, can take a look in my wallet. Why should he be able to do so? No reason to allow that.

It would even be easier. I mean, its somewhat annoying that i have to put my password in for every single transaction. I see that it makes sense in order to have your wallet protected when youre not on your pc, but i would like to have some more control about that.

For example setting a timeout of "After 1 Minute of inactivity with electrum (no clicks or anything done in it) hide the wallet and ask for the pass again".

This way no one could look at my addresses and when i would need to send a couple transactions then i would be able to do so without having to enter the pass again and again.

 

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June 21, 2015, 12:03:37 AM
 #1771

I would prefer the MPK to be encrypted and a password prompt shown upon opening Electrum. I think Mycelium does this now?

I would second that. I never thought about that till now. My wallet is private and when its encrypted then it should mean no one can see inside, except me. At the moment everyone who has access to my pc, which is in fact no one but still, can take a look in my wallet. Why should he be able to do so? No reason to allow that.

It would even be easier. I mean, its somewhat annoying that i have to put my password in for every single transaction. I see that it makes sense in order to have your wallet protected when youre not on your pc, but i would like to have some more control about that.

For example setting a timeout of "After 1 Minute of inactivity with electrum (no clicks or anything done in it) hide the wallet and ask for the pass again".

This way no one could look at my addresses and when i would need to send a couple transactions then i would be able to do so without having to enter the pass again and again.

Concur.

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June 23, 2015, 07:13:21 AM
 #1772

I send a payment and i get this error:

global name 'paymentrequest_pb2' is not defined

The payment has been sent anyway, but what does that error mean?
I'm using Electrum 2.1.1

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June 23, 2015, 01:32:23 PM
 #1773

I send a payment and i get this error:

global name 'paymentrequest_pb2' is not defined

The payment has been sent anyway, but what does that error mean?
I'm using Electrum 2.1.1

It appears to be a bug. I opened an issue here: https://github.com/spesmilo/electrum/issues/1312

Edit: it's just been fixed, and should make it into the next release (after 2.3.2).
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June 23, 2015, 03:06:53 PM
 #1774

If BIP47 gets accepted, will the practice of sharing MPK be deprecated by it?
I have never used Electrum but I was planing to do so because I like the idea of increased privacy of sharing a MPK, but i've read that sharing a MPK has its risks.. doesn't BIP47 do what HD wallets tries to achieve (avoiding that the sender can know where he is paying to) but better?

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June 23, 2015, 06:37:38 PM
 #1775

Can there be a feature added to alert that you're using an outdated stable version of Electrum? OSX client didn't the last couple of versions.

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June 23, 2015, 11:10:12 PM
 #1776

Can there be a feature added to alert that you're using an outdated stable version of Electrum?

In windows there is a notice of a new version.  Sadly, it hasn't been updated and still says New version available: 2.2 (where 2.3.2 is current).

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June 24, 2015, 05:30:46 AM
 #1777

In windows there is a notice of a new version.  Sadly, it hasn't been updated and still says New version available: 2.2 (where 2.3.2 is current).
I just updated it, thanks.

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June 24, 2015, 10:51:55 AM
 #1778

Why is the new electrum enforce a minimum fee of 0.00001BTC? Even when setting the fee settings to zero. So why is that? Previous versions allowed to send zero fee transactions and those transaction went through with the same speed practically.

When a fee isnt sufficient then the nodes will say something, resulting in an error message from electrum. So this should be enough. Why the not changeable minimumfee now?

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June 24, 2015, 08:18:54 PM
 #1779

I would prefer the MPK to be encrypted and a password prompt shown upon opening Electrum. I think Mycelium does this now?

I third this, as an option in the GUI to password protect on opening, and encrypting of the MPK.

Also, there should be an option to enable a password on opening Electrum for a Trezor wallet, especially when it's watch only. When it's not watch only (i.e. the Trezor is plugged in) the Trezor requires its PIN, so an additional password wouldn't be as necessary, but it may still be necessary for decryption of the MPK, or can having the Trezor plugged in bypass this?
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June 24, 2015, 08:22:11 PM
 #1780

Why is the new electrum enforce a minimum fee of 0.00001BTC? Even when setting the fee settings to zero. So why is that? Previous versions allowed to send zero fee transactions and those transaction went through with the same speed practically.

When a fee isnt sufficient then the nodes will say something, resulting in an error message from electrum. So this should be enough. Why the not changeable minimumfee now?

If this is the case, it's also problem for me, because I specifically started using Electrum with my Trezor to be able to make no-fee transactions when the coins are sufficiently old.
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