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Author Topic: HOWTO: create a 100% secure wallet  (Read 275355 times)
MildBill
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September 30, 2012, 04:10:34 PM
 #1001

Thanks for the info
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Werner
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October 01, 2012, 02:05:55 AM
 #1002

i thank all for informations provide.
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October 01, 2012, 05:04:14 AM
 #1003

Thanks for this interesting writeup. The most salient point for me was the idea that my "wallet" could be stolen now, but it could be emptied years in the future when there is a trove of BTC in it... Eternal vigilance will pay!
sudukibiras
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October 01, 2012, 08:00:12 AM
 #1004

Grate TUT!
I've been looking for something like this before but coulnd't find anything.
Thanks!
chingping
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October 01, 2012, 06:47:03 PM
 #1005

Great thread...Very helpful.  I'm using the BlockChain.Info wallet and so far, Im impressed with the features and ease of use.
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October 01, 2012, 10:22:20 PM
 #1006

I'm using blockchain here, but I'm thinking about moving my wallet offline with Armory.  Anyone here use Yubikey with blockchain?  I've often wondered how secure it is even with Yubikey.
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October 01, 2012, 11:51:46 PM
 #1007

There is another way in which you can get robbed.

Since any valid Bitcoin transaction must get in the public block chain. Your public keys must be in the block chain. And some body might use the block chain to calculate what is the balance of a 'big' and 'static' Bitcoin address and use a cryptographic attack that address to find out the corresponding private key. It might take months, but you are not moving those Bitcoins so the attacker can take the time. Once he has the private key he makes a transaction to one of is addresses.

Fcx35x10
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October 02, 2012, 03:46:50 AM
 #1008

Thanks for the helpful tips
thebitbabe
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October 02, 2012, 05:25:00 AM
 #1009

Is totally secured even really possible?
BkkCoins
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October 02, 2012, 06:41:22 AM
 #1010

There is another way in which you can get robbed.

Since any valid Bitcoin transaction must get in the public block chain. Your public keys must be in the block chain. And some body might use the block chain to calculate what is the balance of a 'big' and 'static' Bitcoin address and use a cryptographic attack that address to find out the corresponding private key. It might take months, but you are not moving those Bitcoins so the attacker can take the time. Once he has the private key he makes a transaction to one of is addresses.
Try all the time of the universe, billions of billions of years, then maybe, just maybe you may have a better chance than one atom out of all the atoms on planet earth. I wasn't going to bother posting but that "It might take months" was just too juicy to pass up.

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October 02, 2012, 05:52:14 PM
 #1011

There is another way in which you can get robbed.

Since any valid Bitcoin transaction must get in the public block chain. Your public keys must be in the block chain. And some body might use the block chain to calculate what is the balance of a 'big' and 'static' Bitcoin address and use a cryptographic attack that address to find out the corresponding private key. It might take months, but you are not moving those Bitcoins so the attacker can take the time. Once he has the private key he makes a transaction to one of is addresses.
Try all the time of the universe, billions of billions of years, then maybe, just maybe you may have a better chance than one atom out of all the atoms on planet earth. I wasn't going to bother posting but that "It might take months" was just too juicy to pass up.


Good luck with your assumption that:
1. The discrete logarithm in the subgroup spanned by g (resp. G) is hard.
2. SHA-1 is a one-way hash function.
3. SHA-1 is a collision-resistant hash function.
4. The generator for k is unpredictable.
will hold for billions and billions of years for any given pair of keys.

majorddf
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October 02, 2012, 06:48:57 PM
 #1012

Nice info-rant, you sound like me after a few beers :p
Monkey1
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October 02, 2012, 09:10:47 PM
 #1013

Define completely secured?  Is your wallet with paper money 'completely secured' downstairs while you sleep updatirs?  Is your cash in the bank 'completely secured', especially these past few years when banks are more likely to go under than give youyour cash. 

the point I am trying to make is that its all relative.  Its more secure than anything else around, but nothing is completely secure!

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citboin
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October 03, 2012, 02:43:49 AM
 #1014

What happens if I have a wallet, receive a payment on the first address and send one, then someone sends me a payment to the first address? Is this payment compromised in any way?
Cm5xng
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October 03, 2012, 02:59:40 PM
 #1015

I am curious that if someone else has your wallet.dat's copy too, can they bruteforce it and get all the cash?
chorchonga
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October 03, 2012, 07:28:13 PM
 #1016

If someone has your wallet.dat, they already have your private keys and have no need to bruteforce.  Look up public-key encryption if that doesn't make sense.

Buy vinyl decals with Bitcoin: http://www.azurerocket.com
lile
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October 04, 2012, 11:18:11 AM
 #1017

What happens if I have a wallet, receive a payment on the first address and send one, then someone sends me a payment to the first address? Is this payment compromised in any way?
No, it is not compromised. It wouldn't be a very good system if it were.

If someone has your wallet.dat, they already have your private keys and have no need to bruteforce.  Look up public-key encryption if that doesn't make sense.
Not if the private keys are encrypted. In that case if a weak password was used someone could bruteforce it, sure.
#machinist
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October 05, 2012, 06:24:02 PM
 #1018

Anyone using Yubikey to provide some feedback? mt.gox used to have one
Zeek_W
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October 06, 2012, 12:30:41 AM
 #1019

Great read!

My toughbook has fingerprint read, smart card authentication and I'm in the process of getting them to work with the linux distro I am liveCDing. Also as the toughbook has had quite a 'tough' life the USB ports are fried so anyone who wants to gather info off it onto USB sticks end up with a blown up USB Stick Tongue

shwoop
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October 07, 2012, 12:07:24 PM
 #1020

Fascinating read.

I think an additional security consideration is to diversify.
I currently spread my funds across a few online wallets and a few computers.
Generating the wallets on a liveCD and securing them over multiple .dat's is a great idea.
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