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Yubikey Tools applications were updated to version 1.1 which brings Offline YubiKey authentication. For this to work you will need another tool called GinaConsole (work name) which will be released soon as a separate download. For now, we are showing you how Test Tool works, once a YubiKey is configured for Offline authentication.

As you can see, this YubiKey is not validated on Yubico’s online servers (since it was reprogrammed and its AES key was not uploaded to Yubico), but is validated successfully locally on this computer. The second attempt fails with “replayed OTP” response, as expected.

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A small update about Yubikey Tools. Now they are supporting Offline authentication. First you run GinaConsole tool to enable Offline mode. You will have to provide Private ID and AES Key in order to activate the feature:

Then, there is a new CheckBox available in Logon dialog which controls the Offline authentication behavior: