Time-Based Uni-Directional Attestation
draft-birkholz-rats-tuda-03

Document Type Active Internet-Draft (individual)
Authors Andreas Fuchs  , Henk Birkholz  , Ira McDonald  , Carsten Bormann 
Last updated 2020-07-13
Replaces draft-birkholz-i2nsf-tuda
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RATS Working Group                                              A. Fuchs
Internet-Draft                                               H. Birkholz
Intended status: Standards Track                          Fraunhofer SIT
Expires: January 14, 2021                                    I. McDonald
                                                          High North Inc
                                                              C. Bormann
                                                 Universitaet Bremen TZI
                                                           July 13, 2020

                 Time-Based Uni-Directional Attestation
                      draft-birkholz-rats-tuda-03

Abstract

   This documents defines the method and bindings used to conduct Time-
   based Uni-Directional Attestation (TUDA) between two RATS (Remote
   ATtestation procedureS) entities over the Internet.  TUDA does not
   require a challenge-response handshake and thereby does not rely on
   the conveyance of a nonce to prove freshness of remote attestation
   Evidence.  Conversely, TUDA enables the creation of Secure Audit Logs
   that can constitute Evidence about current and past operational
   states of an Attester.  Every RATS entity requires access to a
   trustable and synchronized time-source.  A Handle Distributor takes
   on the corresponding role of a Time Stamp Authority (TSA) to provide
   Time Stamp Tokens (TST) to all RATS entities.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 14, 2021.

Fuchs, et al.           Expires January 14, 2021                [Page 1]
Internet-Draft                    TUDA                         July 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Forward Authenticity  . . . . . . . . . . . . . . . . . .   4
     1.2.  Handle Distributor  . . . . . . . . . . . . . . . . . . .   5
     1.3.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Evidence in TUDA  . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Generating Evidence about Software Component Integrity  . . .   6
     3.1.  Measurements and Digests Generated by an Attester . . . .   6
     3.2.  Attesting Environments and Roots of Trust . . . . . . . .   6
     3.3.  Primitive Operations for Remote Attestation . . . . . . .   7
   4.  Remote Attestation Principles . . . . . . . . . . . . . . . .   7
     4.1.  Indeterministic Measurements  . . . . . . . . . . . . . .   8
     4.2.  Principles of Uni-Directional and Time-Based Attestation    8
     4.3.  TUDA Attesting Environment Requirements . . . . . . . . .   9
     4.4.  TUDA Handle Distributor: Time Stamp Authority . . . . . .   9
     4.5.  Information Elements and Conveyance . . . . . . . . . . .  10
     4.6.  TUDA Objectives . . . . . . . . . . . . . . . . . . . . .  10
     4.7.  Hardware Dependencies . . . . . . . . . . . . . . . . . .  11
   5.  TUDA Core Concept . . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  TPM Specific Terms  . . . . . . . . . . . . . . . . . . .  12
     5.2.  Certificates  . . . . . . . . . . . . . . . . . . . . . .  13
   6.  The TUDA Protocol Family  . . . . . . . . . . . . . . . . . .  13
     6.1.  TUDA Information Elements Update Cycles . . . . . . . . .  15
   7.  Sync Base Protocol  . . . . . . . . . . . . . . . . . . . . .  18
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  19
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
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