A Quantum Immortal

I was asked how I use a Yubikey. This is how I do it:

1. I ordered a Yubikey from Yubico. An Mt. Gox Yubikey is only good on Mt. Gox, you need a generic Yubikey.
2. Actually, I ordered two. If one of them is lost the other can’t be used to access it, but I don’t want to waste time ordering another one … I want to have a backup.
3. On blockchain.info I attach my Yubikey to one of our more secure wallets.
4. Then, whenever I log in to blockchain.info, my Yubikey is required.
5. I still retain the complete encrypted backup of my wallet, which of course does not require a Yubikey to decrypt.
   This is why Yubikey only semi-protects you … against a specific type of attack (for further security, use a cold wallet).

If my primary Yubikey will ever be lost or destroyed, I will decrypt my backup, open a new blockchain.info account, import my previous wallet, and secure that with my new Yubikey.