anima Working Group T. Werner Internet-Draft Siemens AG Updates: RFC8366 (if approved) M. Richardson Intended status: Standards Track Sandelman Software Works Expires: 12 January 2023 11 July 2022 JWS signed Voucher Artifacts for Bootstrapping Protocols draft-ietf-anima-jws-voucher-04 Abstract [RFC8366] defines a digital artifact called voucher as a YANG-defined JSON document that has been signed using a Cryptographic Message Syntax (CMS) structure. This memo introduces a variant of the voucher structure in which CMS is replaced by the JSON Object Signing and Encryption (JOSE) mechanism described in RFC7515 to better support use-cases in which JOSE is preferred over CMS. In addition to explaining how the format is created, MIME types are registered and examples are provided. 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 Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 12 January 2023. Copyright Notice Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights Werner & Richardson Expires 12 January 2023 [Page 1] Internet-Draft JWS-voucher July 2022 and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Voucher Artifact with JSON Web Signature . . . . . . . . . . 3 3.1. Unprotected Header . . . . . . . . . . . . . . . . . . . 4 3.2. Protected Header . . . . . . . . . . . . . . . . . . . . 4 3.3. Voucher Representation in General JWS JSON Serialization Syntax . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Privacy Considerations . . . . . . . . . . . . . . . . . . . 5 5. Security Considerations . . . . . . . . . . . . . . . . . . . 5 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 6.1. Media-Type Registry . . . . . . . . . . . . . . . . . . . 6 6.1.1. application/voucher-jws+json . . . . . . . . . . . . 6 7. Changelog . . . . . . . . . . . . . . . . . . . . . . . . . . 6 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7 8.1. Normative References . . . . . . . . . . . . . . . . . . 7 8.2. Informative References . . . . . . . . . . . . . . . . . 7 Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 9 A.1. Example Pledge Voucher Request - PVR (from Pledge to Registrar) . . . . . . . . . . . . . . . . . . . . . . . 9 A.2. Example Parboiled Registrar Voucher Request - RVR (from Registrar to MASA) . . . . . . . . . . . . . . . . . . . 10 A.3. Example Voucher Response (from MASA to Pledge, via Registrar) . . . . . . . . . . . . . . . . . . . . . . . 13 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15 1. Introduction "A Voucher Artifact for Bootstrapping Protocols" [RFC8366] describes a voucher artifact used in "Bootstrapping Remote Secure Key Infrastructure" [BRSKI] and "Secure Zero Touch Provisioning" [SZTP] to transfer ownership of a device from a manufacturer to an owner. That document defines the base YANG module and the serialization to JSON [RFC8259] with a CMS signature according to [RFC5652]. The resulting Voucher artifact has the media type "application/voucher- cms+json". Other work, [I-D.ietf-anima-constrained-voucher] provides a mapping of the YANG to CBOR [RFC8949] with a signature format of COSE [RFC8812]. Werner & Richardson Expires 12 January 2023 [Page 2] Internet-Draft JWS-voucher July 2022 This document provides an equivalent mapping of JSON format with the signature format JSON Web Signature (JWS) [RFC7515]. The encoding specified in this document is used by [I-D.ietf-anima-brski-prm] and may be preferred for use cases requiring signed JSON objects. This document does not extend the YANG definition of [RFC8366]. With the availability of different encoded vouchers, it is up to an industry specific application statement to indicate/decide which voucher signature format is to be used. There is no provision across the different voucher signature formats that a receiver could safely recognize which format it uses unless additional context is provided. For example, [BRSKI] provides this context via the MIME-Type for the voucher artifact. This document should be considered an update to [RFC8366] in the category of "See Also" as per [I-D.kuehlewind-update-tag]. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 3. Voucher Artifact with JSON Web Signature The voucher [RFC8366] JSON structure consists of a nested map, the outer part of which is: { "ietf-voucher:voucher" : { some inner items }} this is considered the JSON payload as described in [RFC7515] section 3. A JWS JSON Serialization Overview is given by The following serializations are defined:[RFC7515] in section 3.2 and section 7 provides more details. 1. "JWS Compact Serialization", [RFC7515] section 7.1 2. "JWS JSON Serialization" in, [RFC7515] section 7.2 - "General JWS JSON Serialization Syntax", [RFC7515] section 7.2.1 Werner & Richardson Expires 12 January 2023 [Page 3] Internet-Draft JWS-voucher July 2022 - "Flattened JWS JSON Serialization Syntax", [RFC7515] section 7.2.2 This document makes use of the "General JWS JSON Serialization Syntax" to support multi signatures. [RFC Editor: please delete] /* TODO: ... */ [RFC Editor: please delete] /* TODO: ... */ There are a number of attributes. They are: 3.1. Unprotected Header [RFC Editor: please delete] /* TODO: ... */ 3.2. Protected Header The standard "typ" and "alg" values described in [RFC7515] are expected in the protected headers. It remains to be determined (XXX), what values, if any, should go into the "typ" header, as in the [BRSKI] use cases, there are additional HTTP MIME type headers to indicate content types. The "alg" should contain the algorithm type such as "ES256". If PKIX [RFC5280] format certificates are used then the [RFC7515] section 4.1.6 "x5c" certificate chain SHOULD be used to contain the certificate and chain. Vouchers will often need all certificates in the chain, including what would be considered the trust anchor certificate because intermediate devices (such as the Registrar) may need to audit the artifact, or end systems may need to pin a trust anchor for future operations. This is consistent with [BRSKI] section 5.5.2. 3.3. Voucher Representation in General JWS JSON Serialization Syntax Werner & Richardson Expires 12 January 2023 [Page 4] Internet-Draft JWS-voucher July 2022 { "payload": { "ietf-voucher:voucher": { "assertion": "logged", "serial-number": "0123456789", "nonce": "5742698422680472", "created-on": "2022-07-08T03:01:24.618Z", "pinned-domain-cert": "base64encodedvalue==" } }, "signatures": [ { "protected": { "x5c": [ "base64encodedvalue==" ], "alg": "ES256", "typ": "voucher-jws+json" }, "signature": "base64encodedvalue==" } ] } Figure 1: Voucher Representation in General JWS JSON Serialization Syntax 4. Privacy Considerations The Voucher Request reveals the IDevID of the component (Pledge) that is on-boarding. This request occurs over HTTP-over-TLS, however the Pledge to Registrar transaction is over a provisional TLS session, and it is subject to disclosure via by a Dolev-Yao attacker (a "malicious messenger")[onpath]. This is explained in [BRSKI] section 10.2. The use of a JWS header brings no new privacy considerations. 5. Security Considerations The issues of how [RFC8366] vouchers are used in a [BRSKI] system is addressed in section 11 of that document. This document does not change any of those issues, it just changes the signature technology used for vouchers and voucher requests. [SZTP] section 9 deals with voucher use in Secure Zero Touch Provisioning, and this document also makes no changes to security. Werner & Richardson Expires 12 January 2023 [Page 5] Internet-Draft JWS-voucher July 2022 6. IANA Considerations 6.1. Media-Type Registry This section registers the 'application/voucher-jws+json' in the "Media Types" registry. 6.1.1. application/voucher-jws+json Type name: application Subtype name: voucher-jws+json Required parameters: none Optional parameters: none Encoding considerations: JWS+JSON vouchers are JOSE objects signed with one signer. Security considerations: See Security Considerations, Section Interoperability considerations: The format is designed to be broadly interoperable. Published specification: THIS RFC. Applications that use this media type: ANIMA, 6tisch, and other zero-touch imprinting systems Additional information: Magic number(s): None File extension(s): .vjj Macintosh file type code(s): none Person & email address to contact for further information: IETF ANIMA WG Intended usage: LIMITED Restrictions on usage: NONE Author: ANIMA WG Change controller: IETF Provisional registration? (standards tree only): NO 7. Changelog * Added adoption call comments from Toerless. Changed from [RFCxxxx] to [THING] style for some key references. * Updated references "I-D.ietf-anima-brski-async-enroll" switched to "I-D.ietf-anima-brski-prm" * Switch from "JWS Compact Serialization" to "General JWS JSON Serialization", as focus is now on "General JWS JSON Serialization" * Include Voucher representation in "General JWS JSON Serialization" syntax Werner & Richardson Expires 12 January 2023 [Page 6] Internet-Draft JWS-voucher July 2022 * Include examples A1, A2, A3 using "General JWS JSON Serialization" * Added optional "typ": "voucher-jws+json" header parameter to JWS objects 8. References 8.1. Normative References [BRSKI] Pritikin, M., Richardson, M., Eckert, T., Behringer, M., and K. Watsen, "Bootstrapping Remote Secure Key Infrastructure (BRSKI)", RFC 8995, DOI 10.17487/RFC8995, May 2021, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC7515] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, May 2015, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8259] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data Interchange Format", STD 90, RFC 8259, DOI 10.17487/RFC8259, December 2017, . [RFC8366] Watsen, K., Richardson, M., Pritikin, M., and T. Eckert, "A Voucher Artifact for Bootstrapping Protocols", RFC 8366, DOI 10.17487/RFC8366, May 2018, . [SZTP] Watsen, K., Farrer, I., and M. Abrahamsson, "Secure Zero Touch Provisioning (SZTP)", RFC 8572, DOI 10.17487/RFC8572, April 2019, . 8.2. Informative References Werner & Richardson Expires 12 January 2023 [Page 7] Internet-Draft JWS-voucher July 2022 [I-D.ietf-anima-brski-prm] Fries, S., Werner, T., Lear, E., and M. C. Richardson, "BRSKI with Pledge in Responder Mode (BRSKI-PRM)", Work in Progress, Internet-Draft, draft-ietf-anima-brski-prm-04, 8 July 2022, . [I-D.ietf-anima-constrained-voucher] Richardson, M., Stok, P. V. D., Kampanakis, P., and E. Dijk, "Constrained Bootstrapping Remote Secure Key Infrastructure (BRSKI)", Work in Progress, Internet-Draft, draft-ietf-anima-constrained-voucher-17, 7 April 2022, . [I-D.kuehlewind-update-tag] Kuehlewind, M. and S. Krishnan, "Definition of new tags for relations between RFCs", Work in Progress, Internet- Draft, draft-kuehlewind-update-tag-04, 12 July 2021, . [onpath] "can an on-path attacker drop traffic?", n.d., . [RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., and W. Polk, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008, . [RFC5652] Housley, R., "Cryptographic Message Syntax (CMS)", STD 70, RFC 5652, DOI 10.17487/RFC5652, September 2009, . [RFC8792] Watsen, K., Auerswald, E., Farrel, A., and Q. Wu, "Handling Long Lines in Content of Internet-Drafts and RFCs", RFC 8792, DOI 10.17487/RFC8792, June 2020, . [RFC8812] Jones, M., "CBOR Object Signing and Encryption (COSE) and JSON Object Signing and Encryption (JOSE) Registrations for Web Authentication (WebAuthn) Algorithms", RFC 8812, DOI 10.17487/RFC8812, August 2020, . Werner & Richardson Expires 12 January 2023 [Page 8] Internet-Draft JWS-voucher July 2022 [RFC8949] Bormann, C. and P. Hoffman, "Concise Binary Object Representation (CBOR)", STD 94, RFC 8949, DOI 10.17487/RFC8949, December 2020, . Appendix A. Examples These examples are folded according to [RFC8792] Single Backslash rule. A.1. Example Pledge Voucher Request - PVR (from Pledge to Registrar) The following is an example request sent from a Pledge to the Registrar, in "General JWS JSON Serialization". { "payload": "eyJpZXRmLXZvdWNoZXItcmVxdWVzdDp2b3VjaGVyIjp7InNlcmlhbC1 udW1iZXIiOiIwMTIzNDU2Nzg5Iiwibm9uY2UiOiI2R3RuK1pRS04ySHF ERlZrQkV4WkxRPT0iLCJjcmVhdGVkLW9uIjoiMjAyMi0wNy0wOFQwODo 0MDo0Mi44MjBaIiwicHJveGltaXR5LXJlZ2lzdHJhci1jZXJ0IjoiTUl JQjRqQ0NBWWlnQXdJQkFnSUdBWFk3MmJiWk1Bb0dDQ3FHU000OUJBTUN NRFV4RXpBUkJnTlZCQW9NQ2sxNVFuVnphVzVsYzNNeERUQUxCZ05WQkF jTUJGTnBkR1V4RHpBTkJnTlZCQU1NQmxSbGMzUkRRVEFlRncweU1ERXl NRGN3TmpFNE1USmFGdzB6TURFeU1EY3dOakU0TVRKYU1ENHhFekFSQmd OVkJBb01DazE1UW5WemFXNWxjM014RFRBTEJnTlZCQWNNQkZOcGRHVXh HREFXQmdOVkJBTU1EMFJ2YldGcGJsSmxaMmx6ZEhKaGNqQlpNQk1HQnl xR1NNNDlBZ0VHQ0NxR1NNNDlBd0VIQTBJQUJCazE2Sy9pNzlvUmtLNVl iZVBnOFVTUjgvdXMxZFBVaVpITXRva1NkcUtXNWZuV3NCZCtxUkw3V1J mZmVXa3lnZWJvSmZJbGx1cmNpMjV3bmhpT1ZDR2plekI1TUIwR0ExVWR KUVFXTUJRR0NDc0dBUVVGQndNQkJnZ3JCZ0VGQlFjREhEQU9CZ05WSFE 4QkFmOEVCQU1DQjRBd1NBWURWUjBSQkVFd1A0SWRjbVZuYVhOMGNtRnl MWFJsYzNRdWMybGxiV1Z1Y3kxaWRDNXVaWFNDSG5KbFoybHpkSEpoY2k xMFpYTjBOaTV6YVdWdFpXNXpMV0owTG01bGREQUtCZ2dxaGtqT1BRUUR BZ05JQURCRkFpQnhsZEJoWnEwRXY1SkwyUHJXQ3R5UzZoRFlXMXlDTy9 SYXVicEM3TWFJRGdJaEFMU0piZ0xuZ2hiYkFnMGRjV0ZVVm8vZ0dOMC9 qd3pKWjBTbDJoNHhJWGsxIn19", "signatures": [ { "protected": "eyJ4NWMiOlsiTUlJQitUQ0NBYUNnQXdJQkFnSUdBWG5WanNVNU1Bb0d DQ3FHU000OUJBTUNNRDB4Q3pBSkJnTlZCQVlUQWtGUk1SVXdFd1lEVlF RS0RBeEthVzVuU21sdVowTnZjbkF4RnpBVkJnTlZCQU1NRGtwcGJtZEt hVzVuVkdWemRFTkJNQ0FYRFRJeE1EWXdOREExTkRZeE5Gb1lEems1T1R reE1qTXhNak0xT1RVNVdqQlNNUXN3Q1FZRFZRUUdFd0pCVVRFVk1CTUd BMVVFQ2d3TVNtbHVaMHBwYm1kRGIzSndNUk13RVFZRFZRUUZFd293TVR Jek5EVTJOemc1TVJjd0ZRWURWUVFEREE1S2FXNW5TbWx1WjBSbGRtbGp aVEJaTUJNR0J5cUdTTTQ5QWdFR0NDcUdTTTQ5QXdFSEEwSUFCQzc5bGl Werner & Richardson Expires 12 January 2023 [Page 9] Internet-Draft JWS-voucher July 2022 hUmNCalpjRUVYdzdyVWVhdnRHSkF1SDRwazRJNDJ2YUJNc1UxMWlMREN DTGtWaHRVVjIxbXZhS0N2TXgyWStTTWdROGZmd0wyM3ozVElWQldqZFR Cek1Dc0dDQ3NHQVFVRkJ3RWdCQjhXSFcxaGMyRXRkR1Z6ZEM1emFXVnR aVzV6TFdKMExtNWxkRG81TkRRek1COEdBMVVkSXdRWU1CYUFGRlFMak5 6UFwvU1wva291alF3amc1RTVmdndjWWJNQk1HQTFVZEpRUU1NQW9HQ0N zR0FRVUZCd01DTUE0R0ExVWREd0VCXC93UUVBd0lIZ0RBS0JnZ3Foa2p PUFFRREFnTkhBREJFQWlCdTN3UkJMc0pNUDVzTTA3MEgrVUZyeU5VNmd LekxPUmNGeVJST2xxcUhpZ0lnWENtSkxUekVsdkQycG9LNmR4NmwxXC9 1eW1UbmJRRERmSmxhdHVYMlJvT0U9Il0sInR5cCI6InZvdWNoZXItand zK2pzb24iLCJhbGciOiJFUzI1NiJ9", "signature": "abVg4TDGzSTjVHkQlNeIW3ABu5ZXdMl1cEqwcIAlHFW4BrlGbO-DRTK fyCOGxSW49-ktJcrVlYgKqC4xmZoy0Q" } ] } Figure 2: Example Pledge Voucher Request - PVR A.2. Example Parboiled Registrar Voucher Request - RVR (from Registrar to MASA) The term parboiled refers to food which is partially cooked. In [BRSKI], the term refers to a Pledge voucher-request (PVR) which has been received by the Registrar, and then has been processed by the Registrar ("cooked"), and is now being forwarded to the MASA. The following is an example Registrar voucher-request (RVR) sent from the Registrar to the MASA, in "General JWS JSON Serialization". Note that the previous PVR can be seen in the payload as "prior-signed- voucher-request". { "payload": "eyJpZXRmLXZvdWNoZXItcmVxdWVzdDp2b3VjaGVyIjp7InNlcmlhbC1 udW1iZXIiOiIwMTIzNDU2Nzg5IiwiaWRldmlkLWlzc3VlciI6IkJCZ3d Gb0FVVkF1TTNNLzlMK1NpNk5EQ09Ea1RsKy9CeGhzPSIsIm5vbmNlIjo iNkd0bitaUUtOMkhxREZWa0JFeFpMUT09IiwicHJpb3Itc2lnbmVkLXZ vdWNoZXItcmVxdWVzdCI6ImV5SndZWGxzYjJGa0lqb2laWGxLY0ZwWVV tMU1XRnAyWkZkT2IxcFlTWFJqYlZaNFpGZFdlbVJFY0RKaU0xWnFZVWR XZVVscWNEZEpiazVzWTIxc2FHSkRNWFZrVnpGcFdsaEphVTlwU1hkTlZ FbDZUa1JWTWs1Nlp6VkphWGRwWW0wNWRWa3lWV2xQYVVreVVqTlNkVXN 4Y0ZKVE1EUjVVMGhHUlZKc1duSlJhMVkwVjJ0NFVsQlVNR2xNUTBwcVk yMVdhR1JIVm10TVZ6bDFTV3B2YVUxcVFYbE5hVEIzVG5rd2QwOUdVWGR QUkc4d1RVUnZNRTFwTkRSTmFrSmhTV2wzYVdOSVNuWmxSMngwWVZoU05 VeFlTbXhhTW14NlpFaEthR05wTVdwYVdFb3dTV3B2YVZSVmJFcFJhbEp 4VVRCT1FsZFhiRzVSV0dSS1VXdEdibE5WWkVKWFJtc3pUVzFLYVZkck1 VSmlNR1JFVVROR1NGVXdNREJQVlVwQ1ZGVk9UbEpHVmpSU1dIQkNWV3R Werner & Richardson Expires 12 January 2023 [Page 10] Internet-Draft JWS-voucher July 2022 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Example Voucher Response (from MASA to Pledge, via Registrar) The following is an example voucher response from MASA to Pledge via Registrar, in "General JWS JSON Serialization". Werner & Richardson Expires 12 January 2023 [Page 13] Internet-Draft JWS-voucher July 2022 { "payload": "eyJpZXRmLXZvdWNoZXI6dm91Y2hlciI6eyJhc3NlcnRpb24iOiJsb2 dnZWQiLCJzZXJpYWwtbnVtYmVyIjoiMDEyMzQ1Njc4OSIsIm5vbmNlI joiZGRoSGQ4MlFpUGtzMDBTck1USTlEUT09IiwiY3JlYXRlZC1vbiI6 IjIwMjItMDctMDdUMTc6NDc6MDEuODkwWiIsInBpbm5lZC1kb21haW4 tY2VydCI6Ik1JSUJwRENDQVVtZ0F3SUJBZ0lHQVcwZUx1SCtNQW9HQ0 NxR1NNNDlCQU1DTURVeEV6QVJCZ05WQkFvTUNrMTVRblZ6YVc1bGMzT XhEVEFMQmdOVkJBY01CRk5wZEdVeER6QU5CZ05WQkFNTUJsUmxjM1JE UVRBZUZ3MHhPVEE1TVRFd01qTTNNekphRncweU9UQTVNVEV3TWpNM01 6SmFNRFV4RXpBUkJnTlZCQW9NQ2sxNVFuVnphVzVsYzNNeERUQUxCZ0 5WQkFjTUJGTnBkR1V4RHpBTkJnTlZCQU1NQmxSbGMzUkRRVEJaTUJNR 0J5cUdTTTQ5QWdFR0NDcUdTTTQ5QXdFSEEwSUFCT2t2a1RIdThRbFQz RkhKMVVhSTcrV3NIT2IwVVMzU0FMdEc1d3VLUURqaWV4MDYvU2NZNVB KaWJ2Z0hUQitGL1FUamdlbEhHeTFZS3B3Y05NY3NTeWFqUlRCRE1CSU dBMVVkRXdFQi93UUlNQVlCQWY4Q0FRRXdEZ1lEVlIwUEFRSC9CQVFEQ WdJRU1CMEdBMVVkRGdRV0JCVG9aSU16UWRzRC9qLytnWC83Y0JKdWNI L1htakFLQmdncWhrak9QUVFEQWdOSkFEQkdBaUVBdHhRMytJTEdCUEl 0U2g0YjlXWGhYTnVocVNQNkgrYi9MQy9mVllEalE2b0NJUURHMnVSQ0 hsVnEzeWhCNThUWE1VYnpIOCtPbGhXVXZPbFJEM1ZFcURkY1F3PT0if X0", "signatures": [ { "protected": "eyJ4NWMiOlsiTUlJQmt6Q0NBVGlnQXdJQkFnSUdBV0ZCakNrWU1B b0dDQ3FHU000OUJBTUNNRDB4Q3pBSkJnTlZCQVlUQWtGUk1SVXdFd 1lEVlFRS0RBeEthVzVuU21sdVowTnZjbkF4RnpBVkJnTlZCQU1NRG twcGJtZEthVzVuVkdWemRFTkJNQjRYRFRFNE1ERXlPVEV3TlRJME1 Gb1hEVEk0TURFeU9URXdOVEkwTUZvd1R6RUxNQWtHQTFVRUJoTUNR VkV4RlRBVEJnTlZCQW9NREVwcGJtZEthVzVuUTI5eWNERXBNQ2NHQ TFVRUF3d2dTbWx1WjBwcGJtZERiM0p3SUZadmRXTm9aWElnVTJsbm JtbHVaeUJMWlhrd1dUQVRCZ2NxaGtqT1BRSUJCZ2dxaGtqT1BRTUJ Cd05DQUFTQzZiZUxBbWVxMVZ3NmlRclJzOFIwWlcrNGIxR1d5ZG1X czJHQU1GV3diaXRmMm5JWEgzT3FIS1Z1OHMyUnZpQkdOaXZPS0dCS Eh0QmRpRkVaWnZiN294SXdFREFPQmdOVkhROEJBZjhFQkFNQ0I0QX dDZ1lJS29aSXpqMEVBd0lEU1FBd1JnSWhBSTRQWWJ4dHNzSFAyVkh 4XC90elVvUVwvU3N5ZEwzMERRSU5FdGNOOW1DVFhQQWlFQXZJYjNv K0ZPM0JUbmNMRnNhSlpSQWtkN3pPdXNuXC9cL1pLT2FFS2JzVkRpV T0iXSwidHlwIjoidm91Y2hlci1qd3MranNvbiIsImFsZyI6IkVTMj U2In0", "signature": "y1HLYBFlwouf42XWSKUWjeYQHnG2Q6A4bjA7hvTkB3z1dPwTUljP HtuN2Qex6gDxTfaSiKeoXGsOD4JWOgQJPg" } ] } Figure 4: Example Voucher Response Werner & Richardson Expires 12 January 2023 [Page 14] Internet-Draft JWS-voucher July 2022 Authors' Addresses Thomas Werner Siemens AG Email: thomas-werner@siemens.com Michael Richardson Sandelman Software Works Email: mcr+ietf@sandelman.ca Werner & Richardson Expires 12 January 2023 [Page 15]