Two-factor authentication

[Ecurb123]

Whats a good lower cost way to implement two factor authentication when using bitcoin wallets?

[keewee]

I was expecting a different question in here when I saw the title and I can't answer the OP's question, sorry.

But what I was wondering is if there had been any consideration to implementing two factor authentication in any of the bitcoin clients? Passwords can be guessed, or discovered through key-logging, but with 2FA enabled the coins could not be spent

[Gavin Andresen]

https://gist.github.com/gavinandresen/5616606 sketches out one way to do it.

[Ecurb123]

Yeah I do really good passwords but I'm afraid of keylogging. Lets me ask something else, does the application have to support 2FA or is there another way?

[jchysk]

Passwords are awful. You should check out LaunchKey. It's a passwordless multi-factor (possession, inherence, knowledge) solution. If you want to see it in action and get a feel for the user experience you can use this wallet: https://faucet.launchkey.com