A knowledge base article about Where can I get a YubiKey? provided by the UC Berkeley IT Service Hub - Knowledge Portal
Employees and affiliates can request free YubiKeys by contacting calnet2-stephelp@berkeley.edu.
Students and alumni can purchase YubiKeys from the Yubico website which shows the types of YubiKeys available. The newer ones come with both U2F and OATH-HOTP capability.
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U2F tokens can be set up through the self-serve portal. See the following webpage for more information: YubiKey U2F Token