Download Specifications

The FIDO Alliance has two sets of specifications, U2F and UAF. The Alliance is providing support for deployers of the technology by operating the new fido-dev@fidoalliance.org public discussion list.

The FIDO Alliance produces PDF-formatted specifications as a convenience for readers, however there are occasional issues with these PDF-formatted specifications — for example, truncated figures and spurious characters. Thus readers are advised to refer to the HTML-formatted specs upon encountering any such issues with the PDF-formatted specs.

The latest revisions will always be available on the specifications download page.

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IF YOU ARE NOT YET A MEMBER OF THE FIDO ALLIANCE, AND YOU WOULD LIKE TO COMMENT ON OUR PUBLIC DRAFT SPECIFICATIONS, PLEASE USE THE CONTACT US FORM.

UAF Specifications

U2F Specifications

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