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Defined TLV Types Version - Protocol version negotiation Server-Info - Identification and session resume info One-Time-Password – Request and Response NAK – Expanded NAK format Pin – New Pin options and response Confirm – Mutual Authentication handshake Vendor Specific – Vendor additions Resume – Resumes a prior authentication session User Identifier – Username string Token Serial Number – Allow identification/selection Time Stamp – Time sync information Keep-Alive – Avoid network timeouts |