Bitcoin Forum
May 28, 2024, 01:21:22 PM *
News: Latest Bitcoin Core release: 27.0 [Torrent]
 
  Home Help Search Login Register More  
  Show Posts
Pages: [1] 2 »
1  Bitcoin / Project Development / Re: Bitduino: Generate bitcoin addresses randomly using Arduino on: December 23, 2014, 10:38:06 AM
I created an arduino based paper wallet printer just over a year ago.

https://www.youtube.com/watch?v=f7y_emuo68g

https://github.com/spearson78/paperwallet

In the end the arduino was just too slow so I had to switch to an arm chip for the final self contained prototype.

http://blog.bitfrore.com/

https://github.com/bitfrore/bitfrore
2  Local / Treffen / Re: Bitcoin Community Region Stuttgart on: September 29, 2013, 12:48:39 PM
Leider wegen Krankheit kann ich heute nicht dabei sein. Sad
3  Bitcoin / Project Development / Re: Bitcoin Wallet generation by hand on: September 15, 2013, 07:53:04 PM
This is my attempt at a solution.

https://www.youtube.com/watch?v=CzrgJ0jA4dg

Does it count as a solution if I designed it using a pen and paper Smiley
4  Bitcoin / Project Development / Inside Bitfrore the Cold Paper Wallet Printer on: August 16, 2013, 09:52:16 AM
Check out this series of posts on the technology behind Bitfrore the Cold Paper Wallet Printer.

Part 1 - Basic Components
Part 2 - Hardware
Part 3 - Continuous Confidence Tests
Part 4 - Minimal Attack Surface

Don't forget to show your support for the Bitfrore Crowdfunding campaign.
5  Bitcoin / Project Development / Re: Piper: The Raspberry Pi Paper Wallet Printer - Project Update on: July 25, 2013, 08:54:48 AM
First of all, kudos for the project that excels at so many levels. One detail that bothers me is the thermal printer technology,  for two reasons: (1) most thermal papers are impregnated with bisphenol-A, to the point of representing the main source of BPA found in human bodies, and (2) printouts are too fragile, cannot be laminated, and are sensitive to a wide variety of environmental factors.

You might be interested in my dot matrix based paper wallet printer.

It can print on normal paper and has the expected archival qualities of dot matrix print.

http://www.indiegogo.com/projects/bitfrore-bitcoin-cold-paper-wallet-printer/x/3922568
6  Economy / Service Discussion / Re: Piper Paper Wallet - Why are there no replies??? on: July 24, 2013, 09:38:54 PM
https://bitcointalk.org/index.php?topic=213946
The boot DVD does not need to bring any network interfaces up. Only security risk is the PDF files that you copy to the thumb drive and possibly printer buffer (or wireless network to printer) but if you have a linux friendly printer direct connected not even that issue exists as you can just print from the boot DVD.
As far as a hardware device, there's no need for it.
A boot DVD is all you need.

I'm biased of course but  dedicated device has a much smaller attack surface.

The site used to host the DVD image can be compromised and the image replaced with one that generates predicatable wallets.

The computer used to burn the DVD may be compromised to recognize the iso image and modify it to generate predictable wallets.
This would be impossible to detect without a dedicated offline system that has never seen the internet to verify the integrity of the DVD.

The computer used to run the image may be compromised with a hypervisor rootkit that recognizes the DVD and again modify it to generate predictable wallets.
This is impossible to detect without a dedicated offline system that has never seen the internet to verify the integrity of the DVD.

These modifications would be as simple as crippling the RNG in the kernel.

These are hypothetical but more specific hacks have been written in the past (e.g. Stuxnet)

A dedicated device is still difficult to verify but at least its not a moving target like an malware infested machine "securely" booted from a DVD.









7  Economy / Service Discussion / Re: Piper Paper Wallet - Why are there no replies??? on: July 24, 2013, 09:18:56 PM
The project is quite cool, but it is flawed.
The printer uses thermal paper. Thermal paper fades VERY quickly. Now that's a pretty big flaw.
If the designer changed it to your old style dot matrix printing I'd buy 2 of these right now.

I've been working on a paper wallet printing project for the last few months and just started a crowdfunding campaign.

http://www.indiegogo.com/projects/bitfrore-bitcoin-cold-paper-wallet-printer/x/3922568

I specifically chose a micro dot matrix printer as the basis because I was concerned about archiving thermal printouts.

I need support as its expensive to bootstrap a hardware company in the EU due to the necessary certifications,insurance and waste management costs.

If you're interested please pledge your support.

8  Bitcoin / Project Development / Announcing - Bitfrore - Bitcoin Cold Paper Wallet Printer Crowdfunding Campaign on: July 23, 2013, 10:17:49 AM
Hi,

I've taken my botcoin paper wallet printing project as far as I can with my limited funds.
I need support to cover the startup costs to bring my printer to the market.

Please support my crowdfunding campaign

http://igg.me/at/bitsnap/x/3922568

And help make bitfrore a reality.
9  Local / Treffen / Re: Bitcoin Community Region Stuttgart on: July 14, 2013, 04:04:37 PM
Bring dein Paper-Wallet-Dingens  Smiley

https://bitcointalk.org/index.php?topic=240082

Gerne. Neue "beta testers" sind immer hilfreich.
10  Local / Treffen / Re: Bitcoin Community Region Stuttgart on: July 14, 2013, 02:39:17 PM
Bin auch dabei.
11  Bitcoin / Project Development / Re: Hardware Brain Wallet Generator Demo on: June 22, 2013, 06:42:59 AM
1. Do those words have to be in a dictionary? Could one of my words be Z04n5o8qht29 for instance?

You can enter any text you like the only constraint is you need to be able to remember it.

2. What does it generate if two different people input the exact same string of keywords in? Wouldn't the 2nd guy be able to steal the first guy's coins?

In some ways thats the purpose of a brain wallet. I never write the passphrase down anywhere and in 6 months time I can regenerate the private key by entering the same passphrase and access my funds. In effect I'm the 2nd guy.

This means it is critically important to choose a secure pass phrase. There are guidelines here on the best practices to follow.

https://en.bitcoin.it/wiki/Brainwallet

The example given in the demo is horribly insecure as it is way too short and doesn't include any salt.
12  Bitcoin / Project Development / Hardware Brain Wallet Generator Demo on: June 21, 2013, 08:00:28 PM
Hi,

I uploaded a demo of a prototype hardware brain wallet generator here.

http://www.youtube.com/watch?v=CzrgJ0jA4dg
13  Bitcoin / Bitcoin Discussion / Re: Most secure storage method? on: May 21, 2013, 09:38:11 AM
How long until you have a product ready to sell to the public?

I would be interested.

It's impossible to tell at this stage. This is the first time I've tried to bring a product to market and there's a lot to learn.
14  Bitcoin / Bitcoin Discussion / Re: Most secure storage method? on: May 21, 2013, 09:24:41 AM
My bitcoin paper wallet printer avoids many of the malware concerns when printing paper wallets.

http://www.youtube.com/watch?v=noW77GqmNBQ&feature=youtu.be

Can I trust you? How can I verify all the content of software?


I created a follow up video demonstrating how to verify the software installed on the device.

http://www.youtube.com/watch?v=lcDDv-FvZWU

The source code is published here.

https://github.com/spearson78/paperwallet

Really question is who can you trust or what can you trust. Paranoia does make life rather hard...

Ultimately you can only trust yourself.

If I manage to productize my printer and you are truly paranoid you'll need to
  • open the box and look inside to verify there are no evil components.
  • Verify the software matches the published source code
  • Verify the published source code is not evil.

If you have any additional concerns please let me know preferabl in an open forum such as this.
I need to know them so I can provide the necessary evidence/facilities to mitigate them.


15  Bitcoin / Bitcoin Discussion / Re: Most secure storage method? on: May 21, 2013, 06:15:55 AM
My bitcoin paper wallet printer avoids many of the malware concerns when printing paper wallets.

http://www.youtube.com/watch?v=noW77GqmNBQ&feature=youtu.be
16  Local / Treffen / Re: Jemand aus Südwest-Deutschland? on: May 20, 2013, 12:59:01 PM
Ich bin auch in der Nähe von Stuttgart.
17  Bitcoin / Project Development / Re: New Version of my Offline Paper Wallet Generator on: May 11, 2013, 05:33:55 PM
It was my first time using a dremmel I'm just glad I didn't lose a finger Smiley

I think the next one will come out neater.
18  Bitcoin / Project Development / New Version of my Offline Paper Wallet Generator on: May 11, 2013, 01:49:33 PM
I've made some improvements to my offline paper wallet printer.

Heres a new demo.

http://www.youtube.com/watch?v=noW77GqmNBQ&feature=youtu.be

And a peek into the innards.

http://imgur.com/OeGyVCB

I'm working toward creating a shippable product so I'd really appreciate any advice.

I'm currently using ~€45 worth of parts so a rough guess at a retail price would be €80-€90 depending on the manufacturing effort.

Speed is the major problem at the moment so I'm going to investigate different microcontrollers/processors.

Are there any other suggestions to make this a more compelling product?
19  Bitcoin / Project Development / Re: [ANN] Piper - A hardware-based paper wallet printer and so much more on: May 06, 2013, 08:39:56 PM
Nice to see some more activity in the paper wallet area.

Here's my prototype for a wallet printer.

http://www.youtube.com/watch?v=f7y_emuo68g

I'm afraid I didn't have any wood effect paper to wrap it in Smiley

I agree with the concerns about thermal printing so I'm currently experimenting with the epson m-190 printer.

http://www.youtube.com/watch?v=yWz-9c-KAus

Its dot matrix so I have a good feeling about the longevity of its print outs.

In my opinion $120 seems a bit steep. I'm aiming for $50 for a small run of 100.

I look forward to seeing this develop.
20  Bitcoin / Bitcoin Discussion / Re: Demonstration of my Offline Paper Wallet Generator on: April 21, 2013, 07:12:07 PM
I published the source code here.

https://github.com/spearson78/paperwallet
Pages: [1] 2 »
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!