<p><a href="https://en.bitcoin.it/wiki/Two-factor_paper_wallet" rel="nofollow">I just created this wiki page</a>.</p>

<p>I'm coining the term here, I think ... not sure what was it called when discussed on Bitcointalk.</p>

<p>My question is: Has anyone implemented this "2 factor paper wallet"? Is it being worked on?</p>

CC BY-SA 3.0
2012-08-02T12:33:24.220Z
xpost to bitcointalk: https://bitcointalk.org/index.php?topic=97485.0
ripper234
CC BY-SA 3.0
2012-08-02T22:28:57.247Z
If it later turns out that the keypair generated by the third party is defective, your money is forever lost. You could just as easily create the initial pair yourself as validate it. In any event, it's not really two factor since both factors are the same (something you have).
David Schwartz
CC BY-SA 3.0
2012-08-03T05:08:36.497Z
@DavidSchwartz - a probabilistic verification process: you order 100 key pairs, and test 99 of them. If they're ok, it's very unlikely that the hundredth one (which you'll use for real) is defective.
ripper234
CC BY-SA 3.0
2012-08-03T05:11:07.320Z
Also, you can generate the two keys yourself on N different devices (Android + Windows + Mac + Linux), and test each part separately. The odds that all four systems have Trojans are vastly reduced. https://en.bitcoin.it/wiki/User:Casascius/Base58Check-encoded_objects_proposal#Proposed_specification_for_a_multi-part_key_using_EC_multiplication
ripper234
CC BY-SA 3.0
2012-08-03T10:00:16.867Z
It's not that hard to make sure your key generation systems aren't trojaned. The hard part is securing your key storage systems. This just seems to make more problems than it solves. Though I suppose maybe somebody has a problem that it solves.
David Schwartz
<wallet><security><two-factor>
Is anyone working on / has implemented a "two-factor paper wallet"?
ripper234
# Is anyone working on / has implemented a "two-factor paper wallet"?

(Asked by: username_0 on 2012-08-02)

[I just created this wiki page](https://en.bitcoin.it/wiki/Two-factor_paper_wallet).

I'm coining the term here, I think ... not sure what was it called when discussed on Bitcointalk.

My question is: Has anyone implemented this "2 factor paper wallet"? Is it being worked on?

**Tags:** wallet, security, two-factor

> **Comments:**
> **username_0**: xpost to bitcointalk: https://bitcointalk.org/index.php?topic=97485.0  
> **username_1**: If it later turns out that the keypair generated by the third party is defective, your money is forever lost. You could just as easily create the initial pair yourself as validate it. In any event, it's not really two factor since both factors are the same (something you have).  
> **username_0**: @username_1 - a probabilistic verification process: you order 100 key pairs, and test 99 of them. If they're ok, it's very unlikely that the hundredth one (which you'll use for real) is defective.  
> **username_0**: Also, you can generate the two keys yourself on N different devices (Android + Windows + Mac + Linux), and test each part separately. The odds that all four systems have Trojans are vastly reduced. https://en.bitcoin.it/wiki/User:Casascius/Base58Check-encoded_objects_proposal#Proposed_specification_for_a_multi-part_key_using_EC_multiplication  
> **username_1**: It's not that hard to make sure your key generation systems aren't trojaned. The hard part is securing your key storage systems. This just seems to make more problems than it solves. Though I suppose maybe somebody has a problem that it solves.  

---

## 0 answers

