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A comment on YubiKey 5 Series with New NFC and FIDO2 Passwordless Features. Parent comment

Re:YubiKey 5 Series with New NFC and FIDO2 Passwordless Feat... by Snawoot on Monday September 24, 2018 @12:05PM (#18058821)
It's not possible, unfortunately. So you'll have to do it one by one.
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Re:YubiKey 5 Series with New NFC and FIDO2 Passwordless Feat... by Boulth on Monday September 24, 2018 @02:07PM (#18059874)
Yes, and it's by design. If you could then one random root key would be sufficient to "restore" all keys (as they are derived from that root key). U2F explicitly doesn't allow that given that the protocol has use counters.
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