YubiKey

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A popular security device used, among others, to secure access to various Bitcoin services.

For example, it is used on Mt. Gox and My Wallet.

See also: - http://security.wikia.com/wiki/Yubikey - http://wiki.yubico.com/wiki/index.php/Yubikey

Security model

It is important to understand that Yubikeys use Symmetric Encryption (specifically, AES).