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Author Topic: HOWTO: create a 100% secure wallet  (Read 249774 times)
vendor
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August 13, 2012, 08:02:01 PM
 #901

Thanks for all the info.
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Klapaucius
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August 14, 2012, 01:07:28 PM
 #902

Thanks for the info! Helped a lot  Grin
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August 15, 2012, 07:06:02 PM
 #903

Even though I thought I knew a decent amount, I still learned from this post. Thank you.
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August 16, 2012, 08:49:58 PM
 #904

Thanks for the info, this is very interesting. Dont want a pickpocket stealing all my bitcoins!
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August 17, 2012, 05:53:27 AM
 #905

thanks

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August 17, 2012, 06:12:31 AM
 #906

Thanks (#5 of 5)

Wife of Starfish since 1986
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August 17, 2012, 08:24:44 AM
 #907

this means you need 5 post ?

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August 17, 2012, 03:32:40 PM
 #908

good post. thanks for the tips
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August 17, 2012, 05:01:13 PM
 #909

Thanks (#4 of 5)
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August 17, 2012, 11:37:26 PM
 #910

Hm, I feel 100% security claims are always misleading, even if it's practically true. A live cd can be changed by someone for a cd that has a keylogger installed.

112RyUbTiK5jWf7UYz1ESc5VZ6f7VyhQGs
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August 18, 2012, 11:00:46 AM
 #911

I think many do not realise the importance of wallet.dat this will help them, it's like loosing the key to a safe that cannot be picked or broken into!
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August 18, 2012, 03:40:39 PM
 #912

i never have understand why BlockChain.info is necessary, you can do everything without it...
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August 19, 2012, 12:34:32 AM
 #913

i never have understand why BlockChain.info is necessary, you can do everything without it...

BlockChain.info provides a valuable service. You don't have to wait for a blockchain to load, you just see what is happening live on BlockChain.info

Checkout my site at jaykbtc.squarespace.com
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August 19, 2012, 03:07:17 AM
 #914

tnx for this guide trying as we speak
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August 19, 2012, 12:22:09 PM
 #915

Here's what I've done.

I'm using a mac. I have created an 128bit AES encrypted dmg file of 4Gb. I've put inside all my bitcoin folder and symlinked it to my bitcoin app folder into 'Applications'.

Everytime I need to do a transaction, I mount the dmg and running the bitcoin-bt app from the encrypted folder. I know this can be a bit slow at times; but I don't mind. As an extra measure I've also encrypted my wallet.dat file, just in case.

Cheers.



Thanks for this!
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August 19, 2012, 03:19:05 PM
 #916

man o man so many new things to learn, i'm starting to get data overload.
I got a question though, in your example you use ubuntu live cd. As a greener then green greenhorn so am i , now i got to the point were im gonna download the BTC client, and i stumble upon this thing called PPA.
Securitywise it sounds like a possible leak to me? So can we/i trust these and why, or do we use older version or something. Plz advice
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August 20, 2012, 03:39:46 PM
 #917

Most secure would be brain-wallet, have a long phrase and using SHA256 once or combinations, you can generate a privatey key. Use bitaddress.org to see the public address and private key in any format.

Now you can use any thin client e.g. blockchain.info or electrum command line to send btc, benefit with this approach is that  you are not tied to any computer, don't have to worry about backing up or securing devices too much.

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August 20, 2012, 06:34:39 PM
 #918

i didn't bother to read EVERY thread on here, but a thing to beware of with linux USB / live CDs: if your encryption requires high-quality random numbers, you might not want to generate random keys after booting from a USB boot / live CD; apparently that's not a good choice because the environment is more predictable. Anyone out there ever even take advantage of this flaw? I sure haven't; I've only had wikipedia entertain me with these thoughts Smiley

Honestly, it surely doesn't matter, but for those that love being paranoid: beware of generating keys after freshly booting from a live CD / USB.

As for creating a "100% secure wallet", I don't think it's possible to quantify or measure the % of security that a wallet is under. Keep in mind that your wallet isn't exactly secure if even YOU lose access to it! (It's no longer secure--it is useless!)

im totally lost  Huh
OswaldZeid
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August 22, 2012, 12:54:21 AM
 #919

i didn't bother to read EVERY thread on here, but a thing to beware of with linux USB / live CDs: if your encryption requires high-quality random numbers, you might not want to generate random keys after booting from a USB boot / live CD; apparently that's not a good choice because the environment is more predictable. Anyone out there ever even take advantage of this flaw? I sure haven't; I've only had wikipedia entertain me with these thoughts Smiley

Honestly, it surely doesn't matter, but for those that love being paranoid: beware of generating keys after freshly booting from a live CD / USB.

As for creating a "100% secure wallet", I don't think it's possible to quantify or measure the % of security that a wallet is under. Keep in mind that your wallet isn't exactly secure if even YOU lose access to it! (It's no longer secure--it is useless!)

im totally lost  Huh

Computers don't actually generate random numbers - they don't have the hardware for that. Instead, they use a function that has been shown to produce an evenly distributed, unpredictable result, as long as you don't know the number they start with, also known as the 'seed' - many generators use various information from your computer's memory as the seed. Since a Live CD / USB tends to boot up nearly the same each time (since you don't have a lot of user installed programs starting up every time you do), the actual variation of the seed is lowered, meaning that someone with a sufficiently complicated algorithm and some knowledge has a higher chance of generating the same keys.

Just do some stuff to change the state of your memory before you start generating keys - play some solitaire, pop open a text editor and mash on your keyboard for a while, save that file somewhere... whatever. Of course, you only need to generate keys occasionally, so you mainly want to be careful when generating your original wallet file.
Werner
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August 22, 2012, 01:33:26 AM
 #920

i didn't bother to read EVERY thread on here, but a thing to beware of with linux USB / live CDs: if your encryption requires high-quality random numbers, you might not want to generate random keys after booting from a USB boot / live CD; apparently that's not a good choice because the environment is more predictable. Anyone out there ever even take advantage of this flaw? I sure haven't; I've only had wikipedia entertain me with these thoughts Smiley

Honestly, it surely doesn't matter, but for those that love being paranoid: beware of generating keys after freshly booting from a live CD / USB.

As for creating a "100% secure wallet", I don't think it's possible to quantify or measure the % of security that a wallet is under. Keep in mind that your wallet isn't exactly secure if even YOU lose access to it! (It's no longer secure--it is useless!)

im totally lost  Huh

Computers don't actually generate random numbers - they don't have the hardware for that. Instead, they use a function that has been shown to produce an evenly distributed, unpredictable result, as long as you don't know the number they start with, also known as the 'seed' - many generators use various information from your computer's memory as the seed. Since a Live CD / USB tends to boot up nearly the same each time (since you don't have a lot of user installed programs starting up every time you do), the actual variation of the seed is lowered, meaning that someone with a sufficiently complicated algorithm and some knowledge has a higher chance of generating the same keys.

Just do some stuff to change the state of your memory before you start generating keys - play some solitaire, pop open a text editor and mash on your keyboard for a while, save that file somewhere... whatever. Of course, you only need to generate keys occasionally, so you mainly want to be careful when generating your original wallet file.

he is correct. no randomness is posible from digital machines
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