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Author Topic: Keypair cards now available through Bitbills!  (Read 5980 times)
bcearl
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July 02, 2011, 02:24:57 PM
 #61

How do I know that my engraved key pair is secret?

I will stay with pen and paper (I wouldn't even trust a printer that much!).

I trust all my printers with less than 1 MB or memory Smiley

And what about the printing job scheduler? Does it store the document somewhere? You cannot be sure, pen and paper is easy and fine.

Misspelling protects against dictionary attacks NOT
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Sandoz
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July 02, 2011, 10:04:51 PM
 #62

How do I know that my engraved key pair is secret?

I will stay with pen and paper (I wouldn't even trust a printer that much!).

I trust all my printers with less than 1 MB or memory Smiley

And what about the printing job scheduler? Does it store the document somewhere? You cannot be sure, pen and paper is easy and fine.

I guess the solution is to encrypt a wallet with GPG and have that engraved. That gives Noitev an encrypted code he won't be able to do anything with.

Now: does anyone know whether a newly generated wallet is small enough to fit on a QR code when encrypted with GPG? See http://forum.bitcoin.org/index.php?topic=16266.0 for how to generate a printable and encrypted wallet with GPG, which is what I use as a reference due to the simplicity...
TheBitMan
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July 02, 2011, 11:22:34 PM
 #63

I have that mouse Cool
I also needed to post because this is interesting and I want the updates Smiley
done
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July 02, 2011, 11:58:25 PM
 #64

Very nice
phillipsjk
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July 03, 2011, 12:23:33 AM
 #65

And what about the printing job scheduler? Does it store the document somewhere? You cannot be sure, pen and paper is easy and fine.

If I was going to print them, I would probably boot from read-only media on a machine without network connectivity. My statement about less than 1MB of memory implies the printer does not have network connectivity either.

For the dot-matrix, there is the possibility of lifting the image from the ribbon, but it gets recycled/reused within minutes. A Laser printer may have a similar problem with the drum, but those tend to have over a MB of memory anyway.

James' OpenPGP public key fingerprint: EB14 9E5B F80C 1F2D 3EBE  0A2F B3DE 81FF 7B9D 5160
gigabytecoin
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July 03, 2011, 12:46:00 AM
 #66

Is the "engraving" already rubbing off a bit on the cards?

See the left side of the card in your picture... looks like it's fading or something already? (And it's brand new I can only assume).
flower1024
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July 03, 2011, 09:10:25 AM
 #67

forprivate key security you could use am small chip on the card which needs some kind of pin (with self destruction Wink.

so we have to possibility to name you a few recipient adresses and write our wallet+pin to the card ourselves.

(ok in the wild we would need some kind of terminal to do the actual payment)

i love your idea Wink
bcearl
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July 03, 2011, 09:15:10 AM
 #68

And what about the printing job scheduler? Does it store the document somewhere? You cannot be sure, pen and paper is easy and fine.

If I was going to print them, I would probably boot from read-only media on a machine without network connectivity. My statement about less than 1MB of memory implies the printer does not have network connectivity either.

For the dot-matrix, there is the possibility of lifting the image from the ribbon, but it gets recycled/reused within minutes. A Laser printer may have a similar problem with the drum, but those tend to have over a MB of memory anyway.


I would use a printer in principle, if I knew a printer as good as you seem to do. But I don't know any printer good enough to trust it.

Misspelling protects against dictionary attacks NOT
Noitev
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July 05, 2011, 08:51:14 AM
 #69

Well I was hoping it would come friday, due to weekend and holidays it'll be tomorrow hopefully.

To address concerns.

It does not do and dot matrix or inking, It runs on vectors and as such, the engraver has no real physical observations to get codes. I'll do the engraving offline on a different computer than my main machine. It probably doesn't have a terribly high on board memory. It's possible its fed via usb and would have no on board memory. If not I'll do everything in reason to assure you the codes are safe. If you can tell me a way to wipe any cache I'd be happy. This solution is made so that you don't have to worry about the sent coins. You can send me anything to be engraved. If I make a private public keypair, I can personally assure you that you can trust me and I'll happily use references on the forums that have personally met me if you have any concerns. Feel free to encrypt info should you want to send me personalized info. I'm here to serve you so you can get engraving done without anyone other than a single user on the forum.
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July 05, 2011, 09:10:32 AM
 #70

Is the "engraving" already rubbing off a bit on the cards?

See the left side of the card in your picture... looks like it's fading or something already? (And it's brand new I can only assume).

Yeah, I noticed that too. That was laser engraved not rotary engraved. I didn't burn all the way through and I was able to was it down to a scannable code. My engraver is a rotary engraver and shouldn't have that issue. Additionally the private key scanned well.
eugene2k
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July 05, 2011, 01:21:49 PM
 #71

So... this thread got my imagination running...

Not so far future... You get notified that your uncle you didn't even know about died and your presence is required for reading of his will. You soon find out that your uncle was one rich bastard but all he left you was a small diamond. So you decide to see how much the diamond is worth and take it to a specialist. While looking at the diamond the specialist notices there is an engraving on one of the sides of the diamond. Looking closely you realize it must be a QR code. The QR code is your uncles private key for his wallet containing hundreds of thousands of bitcoins. All in a small diamond Smiley
Ryland R. Taylor-Almanza
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July 05, 2011, 01:44:11 PM
 #72

So... this thread got my imagination running...

Not so far future... You get notified that your uncle you didn't even know about died and your presence is required for reading of his will. You soon find out that your uncle was one rich bastard but all he left you was a small diamond. So you decide to see how much the diamond is worth and take it to a specialist. While looking at the diamond the specialist notices there is an engraving on one of the sides of the diamond. Looking closely you realize it must be a QR code. The QR code is your uncles private key for his wallet containing hundreds of thousands of bitcoins. All in a small diamond Smiley
I'll be right back. I'm going to the grocery store to buy a small diamond.
eugene2k
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July 05, 2011, 03:20:58 PM
 #73

I've already found one for you. No need to go anywhere.
http://www.bluenile.com/emerald-diamond-1-carat-or-less-good-cut-g-color-if-clarity_ld01435822?rf=pd
Noitev
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July 06, 2011, 11:57:55 AM
 #74

Well the engraver is here and anyone who can pm me or respond fast enough can get a cool little plastic card with a public key or whatever including whatever designs you want, on it shipped for 1 btc. only 1 person though for now, getting it all set up
Noitev
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July 06, 2011, 12:02:31 PM
 #75

Well the engraver is here and anyone who can pm me or respond fast enough can get a cool little plastic card with a public key or whatever including whatever designs you want, on it shipped for 1 btc. only 1 person though for now, getting it all set up

dimensions are 75x50mm and a public key qr code should be very scannable and nice as it will be a white bg with black engravings on acrylic
Noitev
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July 06, 2011, 12:58:21 PM
 #76

it seems no one is awake, maybe later
Noitev
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July 09, 2011, 09:11:07 AM
 #77

update!
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