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S/MIME Example Keys and Certificates
draft-dkg-lamps-samples-03

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft whose latest revision state is "Replaced".
Author Daniel Kahn Gillmor
Last updated 2021-02-17
Replaced by draft-ietf-lamps-samples, RFC 9216
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draft-dkg-lamps-samples-03
lamps                                                       D.K. Gillmor
Internet-Draft                                                      ACLU
Intended status: Informational                          17 February 2021
Expires: 21 August 2021

                  S/MIME Example Keys and Certificates
                       draft-dkg-lamps-samples-03

Abstract

   The S/MIME development community benefits from sharing samples of
   signed or encrypted data.  This document facilitates such
   collaboration by defining a small set of X.509v3 certificates and
   keys for use when generating such samples.

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 21 August 2021.

Copyright Notice

   Copyright (c) 2021 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
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Prior Work  . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Certificate Usage . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Certificate Expiration  . . . . . . . . . . . . . . . . .   4
     2.3.  Certificate Revocation  . . . . . . . . . . . . . . . . .   4
     2.4.  Using the CA in Test Suites . . . . . . . . . . . . . . .   4
     2.5.  Certificate Chains  . . . . . . . . . . . . . . . . . . .   5
     2.6.  Passwords . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Example Certificate Authority . . . . . . . . . . . . . . . .   5
     3.1.  Certificate Authority Certificate . . . . . . . . . . . .   5
     3.2.  Certificate Authority Secret Key  . . . . . . . . . . . .   6
   4.  Alice's Sample Certificates . . . . . . . . . . . . . . . . .   7
     4.1.  Alice's Signature Verification End-Entity Certificate . .   7
     4.2.  Alice's Signing Private Key Material  . . . . . . . . . .   8
     4.3.  Alice's Encryption End-Entity Certificate . . . . . . . .   9
     4.4.  Alice's Decryption Private Key Material . . . . . . . . .  10
     4.5.  PKCS12 Object for Alice . . . . . . . . . . . . . . . . .  11
   5.  Bob's Sample  . . . . . . . . . . . . . . . . . . . . . . . .  14
     5.1.  Bob's Signature Verification End-Entity Certificate . . .  14
     5.2.  Bob's Signing Private Key Material  . . . . . . . . . . .  15
     5.3.  Bob's Encryption End-Entity Certificate . . . . . . . . .  16
     5.4.  Bob's Decryption Private Key Material . . . . . . . . . .  17
     5.5.  PKCS12 Object for Bob . . . . . . . . . . . . . . . . . .  18
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   8.  Document Considerations . . . . . . . . . . . . . . . . . . .  21
     8.1.  Document History  . . . . . . . . . . . . . . . . . . . .  22
       8.1.1.  Substantive Changes from -02 to -03 . . . . . . . . .  22
       8.1.2.  Substantive Changes from -01 to -02 . . . . . . . . .  22
       8.1.3.  Substantive Changes from -00 to -01 . . . . . . . . .  22
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  22
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  22
     10.2.  Informative References . . . . . . . . . . . . . . . . .  23
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  23

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1.  Introduction

   The S/MIME ([RFC8551]) development community, in particular the
   e-mail development community, benefits from sharing samples of signed
   and/or encrypted data.  Often the exact key material used does not
   matter because the properties being tested pertain to implementation
   correctness, completeness or interoperability of the overall system.
   However, without access to the relevant secret key material, a sample
   is useless.

   This document defines a small set of X.509v3 certificates ([RFC5280])
   and secret keys for use when generating or operating on such samples.

   An example certificate authority is supplied, and samples are
   provided for two "personas", Alice and Bob.

1.1.  Requirements Language

   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.

1.2.  Terminology

   *  "Certificate Authority" (or "CA") is a party capable of issuing
      X.509 certificates

   *  "End-Entity" is a party that is capable of using X.509
      certificates (and their corresponding secret key material)

   *  "Mail User Agent" (or "MUA") is a program that generates or
      handles [RFC5322] e-mail messages.

1.3.  Prior Work

   [RFC4134] contains some sample certificates, as well as messages of
   various S/MIME formats.  That older work has unacceptably old
   algorithm choices that may introduce failures when testing modern
   systems: in 2019, some tools explicitly mark 1024-bit RSA and
   1024-bit DSS as weak.

   This earlier document also does not use the now widely-accepted PEM
   encoding for the objects, and instead embeds runnable perl code to
   extract them from the document.

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   It also includes examples of messages and other structures which are
   greater in ambition than this document intends to be.  This document
   intends to focus specifically on identity and key material, as a
   starting point for other documents that can develop examples or test
   cases from them.

2.  Background

2.1.  Certificate Usage

   These X.509 certificates ([RFC5280]) are designed for use with S/MIME
   protections ([RFC8551]) for e-mail ([RFC5322]).

   In particular, they should be usable with signed and encrypted
   messages.

2.2.  Certificate Expiration

   The certificates included in this draft expire in 2052.  This should
   be sufficiently far in the future that they will be useful for a few
   decades.  However, when testing tools in the far future (or when
   playing with clock skew scenarios), care should be taken to consider
   the certificate validity window.

   Due to this lengthy expiration window, these certificates will not be
   particularly useful to test or evaluate the interaction between
   certificate expiration and protected messages.

2.3.  Certificate Revocation

   Because these are expected to be used in test suites or examples, and
   we do not expect there to be online network services in these use
   cases, we do not expect these certificates to produce any revocation
   artifacts.

   As a result, there are no OCSP or CRL indicators in any of the
   certificates.

2.4.  Using the CA in Test Suites

   To use these end-entity certificates in a piece of software (for
   example, in a test suite or an interoperability matrix), most tools
   will need to accept the example CA (Section 3) as a legitimate root
   authority.

   Note that some tooling behaves differently for certificates validated
   by "locally-installed root CAs" than for pre-installed "system-level"
   root CAs).  For example, many common implementations of HPKP

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   ([RFC7469]) only applied the designed protections when dealing with a
   certificate issued by a pre-installed "system-level" root CA, and
   were disabled when dealing with a certificate issued by a "locally-
   installed root CA".

   To test some tooling specifically, it may be necessary to install the
   root CA as a "system-level" root CA.

2.5.  Certificate Chains

   In most real-world examples, X.509 certificates are deployed with a
   chain of more than one X.509 certificate.  In particular, there is
   typically a long-lived root CA that users' software knows about upon
   installation, and the end-entity certificate is issued by an
   intermediate CA, which is in turn issued by the root CA.

   The examples presented in this document use a simple two-link
   certificate chain, and therefore may be unsuitable for simulating
   some real-world deployments.

   In particular, testing the use of a "transvalid" certificate (an end-
   entity certificate that is supplied without its intermediate
   certificate) is not possible with the configuration here.

2.6.  Passwords

   Each secret key presented in this draft is unprotected (it has no
   password).

   As such, the secret key objects are not suitable for verifying
   interoperable password protection schemes.

   However, the PKCS#12 [RFC7292] objects do have simple textual
   passwords, because tooling for dealing with passwordless PKCS#12
   objects is underdeveloped at the time of this draft.

3.  Example Certificate Authority

   The example Certificate Authority has the following information:

   *  Name: "Sample LAMPS Certificate Authority"

3.1.  Certificate Authority Certificate

   This cerificate is used to verify certificates issued by the example
   Certificate Authority.

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   -----BEGIN CERTIFICATE-----
   MIIDLDCCAhSgAwIBAgITD5FARp09T2LXr/FPQiI+8ZsGAjANBgkqhkiG9w0BAQ0F
   ADAtMSswKQYDVQQDEyJTYW1wbGUgTEFNUFMgQ2VydGlmaWNhdGUgQXV0aG9yaXR5
   MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3MDY1NDE4WjAtMSswKQYDVQQDEyJT
   YW1wbGUgTEFNUFMgQ2VydGlmaWNhdGUgQXV0aG9yaXR5MIIBIjANBgkqhkiG9w0B
   AQEFAAOCAQ8AMIIBCgKCAQEAnFB71AsptFyqxG4qPtbt2VLJVctHyNXtlIUWve4q
   PSo/+Oi9s3sf+t7krrosxlv626L+Wm05t99ZVKWKn7y2uYyO7/IToRpTwHN1sXga
   Uz/u2gjPfS69R20ZNSKL9EiB78hgCr1UvY5elQoW2Y4zqQGR729pQYI5obT15V8n
   wdyHCTvecvvvMGBiaAk66VlMQCZLG+nVU8wYVCl6fE37Z1qAs12XlUJr3DGgVKGf
   ZpMz55xiV8q11Aobhmx4aPPyE4GWshDDt4DbtYJMGLEeik1AmNHBsmyaQCLBxVE3
   3ZW1UrhK5Pb9qSL4gizDZ7ZaGZNudwjJu20HHVIGQT7nDwIDAQABo0MwQTAPBgNV
   HRMBAf8EBTADAQH/MA8GA1UdDwEB/wQFAwMHBgAwHQYDVR0OBBYEFHhfDlp42Gvk
   VHA9s93s9/Hy+sBHMA0GCSqGSIb3DQEBDQUAA4IBAQAMqotfBm1fUs18JqiTgZhW
   LUo/Oo+l/rVEIMUPN8+uZgxfOwA0u9cE0IAgMdVELfyHuEt5ld+xyS300z1/Z3X0
   w1NpEaLmgBNB70kmjNZkvT/aWDlKE3JVUITYkkLOm10U5J1dF3DjGH+kK+/nbeF2
   mHTquWfm7420fJJNvCWgvylBHCFheFHt450G/2t5b8+0a4Qj6/QPsqGwiD6NjLrA
   gD0oKIyQP6HNQ8fGpYekiLcq8NQ3sFBYsNUmfAy/Zfjo9/5o5qc+2UwRPTv+QUZx
   0bBs2gH3LVOuvgkHXm5EFyfjCInWTOg0PBlsjvHjrROQHSsuL/Bd3uuqG02bJbbj
   -----END CERTIFICATE-----

3.2.  Certificate Authority Secret Key

   This secret key material is used by the example Certificate Authority
   to issue new certificates.

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   -----BEGIN PRIVATE KEY-----
   MIIE/AIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQCcUHvUCym0XKrE
   bio+1u3ZUslVy0fI1e2UhRa97io9Kj/46L2zex/63uSuuizGW/rbov5abTm331lU
   pYqfvLa5jI7v8hOhGlPAc3WxeBpTP+7aCM99Lr1HbRk1Iov0SIHvyGAKvVS9jl6V
   ChbZjjOpAZHvb2lBgjmhtPXlXyfB3IcJO95y++8wYGJoCTrpWUxAJksb6dVTzBhU
   KXp8TftnWoCzXZeVQmvcMaBUoZ9mkzPnnGJXyrXUChuGbHho8/ITgZayEMO3gNu1
   gkwYsR6KTUCY0cGybJpAIsHFUTfdlbVSuErk9v2pIviCLMNntloZk253CMm7bQcd
   UgZBPucPAgMBAAECggEAJ56StD0cFfYC5oTRulm5sYK1O0Sp7jKi5CkTiZJrLFOg
   IVPEeVB0255RMiRIIwK/Q5o9g+f5YCyBNN48k54+ZitFM3YVGZlVrwrUwuWhLoae
   4K6pAJ6vJQJ3CCu4c3NJU+Biz3YLm3wRZw9GmV/cojKeraR8djkuqFj4lmmW5yC7
   mj8XLnl1snOAEZEHhi/10zibru5GoCjwFrmJT8qbmYX89gbua24wcVlmqImzV48z
   lQJ0nJDJ8VPNjwvyX27DjefBw2FgUiT8J/iEmS7BZ+1laF/UyEsxqsZ4odJIVfPT
   /JbGl+VkAoM1R2Qrv6ZFisDVfGZkIpWtSaBlknh+CQKBgQC82Y7gYnG3wiotvTKC
   L5BWMWoknCM4LTM5AqYSZjfpnMsOEfOgzpyABUyK+3zKrzoqxokVfuvHlj2Hzw8Y
   EUQ2gqJdU5iObl3dH0C7K5J/9Kua12VEcv5NFiBs5paMXTub6SdG0CyeUUfDW133
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   h7pmElFElhy71/93T/uv2CA1RaIGSWhTMu+7Z9+/5cb1zRsorgrB2s0tTpDkDnuX
   A1wRbBraWwKBgQCyNUsSi1NsaJmM2AEVwPSfobncGktR87Vmkw1MR5FzrjYfbOlO
   Uip01ItKi89TJM/rFba+xiqRCUG/KrG/sGuCVPwKvZw0rAl/ZMKc3Z09ihF16NTz
   JuC6taqbmW1vv3tEwVwDAudX7rOdslaV0I9rKyXhy9Y0OjPex96zxsOBMQKBgQCt
   Wj7hNojf0FjN3b9YnrkBn4LKfu6/gP0FVfit3y/hnU0m4xJWkJHfCvmYwjeWju6l
   1Te2cdK+m5MeIqsY07VHybWiqKVpkzbbqm7kcrfp1KVNSDjH87eE9NvkuUMEwamH
   53QZbbGv3NwY2+QMM9a5IbgaCNygtviFY0o/NqIBYQKBgQCyki2Y/sKDolNBbjwf
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   2ofP0ZOXP9IDIF2v1X3165LPsieGZv4VzhLivJrfMYfI4p4GkiK44RSUWcxrBAmq
   9SGCNQ8nx1AsXLZn57U52Oji8KA7MDkGCisGAQQBkggSCAExKzApBglghkgBZQME
   AgIEHPBUYbjdNRelyUPep86pkRfIdEPM9N+yPctTfB0=
   -----END PRIVATE KEY-----

4.  Alice's Sample Certificates

   Alice has the following information:

   *  Name: "Alice Lovelace"

   *  E-mail Address: "alice@smime.example"

4.1.  Alice's Signature Verification End-Entity Certificate

   This certificate is used for verification of signatures made by
   Alice.

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   -----BEGIN CERTIFICATE-----
   MIIDbTCCAlWgAwIBAgIToTV4Z0iuK08vZP20oTh//hC8BDANBgkqhkiG9w0BAQ0F
   ADAtMSswKQYDVQQDEyJTYW1wbGUgTEFNUFMgQ2VydGlmaWNhdGUgQXV0aG9yaXR5
   MCAXDTE5MTEyMDA2NTQxOFoYDzIwNTIwOTI3MDY1NDE4WjAZMRcwFQYDVQQDEw5B
   bGljZSBMb3ZlbGFjZTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALT0
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   pWpjXwsA3A5GOtz0FpfgyC7OxsVcF7q4WHWZWleYXFKlQHJD73nQwXP968+A/3rB
   X7PhO0DBbZnfitOLPgPEwjTtdg0VQQ6Wz+CRQ/YbHPKaw7aRphZO63dKvIKp4cQV
   tkWQHi6syTjGsgkLcLNau5LZDQUdsGV+SAo3nBdWCRYV+I65x8Kf4hCxqqmjV3d/
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   Ss08b8zrxIncf+t2DHGuVEy/Qq1drBz8d4ay8zpqAE1tUyL5DcqZiKUfWwZQXSI/
   JlbjQFzYQqTRDnzHWrg1xPeMTO1P2/cplFaseTivyk4cYwOp/W9UAWymOZXF8WcJ
   YCIUXkdcG/nEZxr057KlScrJmFXOoh7Y+8ON4iWYYcAfiNgpUFo/j8BAwrKKaFvd
   lZS9k1Ypb2+UQY75mKJE9Bg=
   -----END CERTIFICATE-----

4.2.  Alice's Signing Private Key Material

   This private key material is used by Alice to create signatures.

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   -----BEGIN PRIVATE KEY-----
   MIIE+gIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQC09InoWDgWPk2a
   f0+StijSNOR8K/hN8D+l078oullsk4ASvSwjsCNo7sHUa4xQUl5JO6VqY18LANwO
   Rjrc9BaX4MguzsbFXBe6uFh1mVpXmFxSpUByQ+950MFz/evPgP96wV+z4TtAwW2Z
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   xrIJC3CzWruS2Q0FHbBlfkgKN5wXVgkWFfiOucfCn+IQsaqpo1d3f9jSkbtAV5w3
   vzfog8919MxKI9H6l4KuElnAtJ7BtZcsl7dUy9u9COgEykRiVokFQgqQ7XNDU+r3
   SeOWwks7AgMBAAECggEAFKD2DG9A1u77q3u3p2WDH3zueTtiqgaT8u8XO+jhOI/+
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   -----END PRIVATE KEY-----

4.3.  Alice's Encryption End-Entity Certificate

   This certificate is used to encrypt messages to Alice.

Gillmor                  Expires 21 August 2021                 [Page 9]
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   -----BEGIN CERTIFICATE-----
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   -----END CERTIFICATE-----

4.4.  Alice's Decryption Private Key Material

   This private key material is used by Alice to decrypt messages.

Gillmor                  Expires 21 August 2021                [Page 10]
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   -----BEGIN PRIVATE KEY-----
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   -----END PRIVATE KEY-----

4.5.  PKCS12 Object for Alice

   This PKCS12 ([RFC7292]) object contains the same information as
   presented in Section 4.1, Section 4.2, Section 4.3, Section 4.4, and
   Section 3.1.

   It is locked with the simple five-letter password "alice".

   -----BEGIN PKCS12-----
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   jzHEEPtKzZa+c2BtzwnVxYi1Tz9BIs0OWLSE5hlYuT8ZQ13/bDlaUmKZgBvEubzZ

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   dtKHb8f5wZc2B+nXGB+TFboGzSuP7gaWu1vKsJNqT/J/FYEqcamI2F+td7z1sGfb
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   -----END PKCS12-----

5.  Bob's Sample

   Bob has the following information:

   *  Name: "Bob Babbage"

   *  E-mail Address: "bob@smime.example"

5.1.  Bob's Signature Verification End-Entity Certificate

   This certificate is used for verification of signatures made by Bob.

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   -----BEGIN CERTIFICATE-----
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   pVUZ9OWDKfM54rYh
   -----END CERTIFICATE-----

5.2.  Bob's Signing Private Key Material

   This private key material is used by Bob to create signatures.

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   -----BEGIN PRIVATE KEY-----
   MIIE+wIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDmcAXSCVGh/02M
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   -----END PRIVATE KEY-----

5.3.  Bob's Encryption End-Entity Certificate

   This certificate is used to encrypt messages to Bob.

Gillmor                  Expires 21 August 2021                [Page 16]
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   -----BEGIN CERTIFICATE-----
   MIIDaDCCAlCgAwIBAgITO17BWkcdhfwmHN7ueuPziuUW1DANBgkqhkiG9w0BAQ0F
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   -----END CERTIFICATE-----

5.4.  Bob's Decryption Private Key Material

   This private key material is used by Bob to decrypt messages.

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   -----BEGIN PRIVATE KEY-----
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   -----END PRIVATE KEY-----

5.5.  PKCS12 Object for Bob

   This PKCS12 ([RFC7292]) object contains the same information as
   presented in Section 5.1, Section 5.2, Section 5.3, Section 5.4, and
   Section 3.1.

   It is locked with the simple three-letter password "bob".

   -----BEGIN PKCS12-----
   MIIXoAIBAzCCFzgGCSqGSIb3DQEHAaCCFykEghclMIIXITCCBCcGCSqGSIb3DQEH
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   -----END PKCS12-----

6.  Security Considerations

   The keys presented in this document should be considered compromised
   and insecure, because the secret key material is published and
   therefore not secret.

   Applications which maintain blacklists of invalid key material SHOULD
   include these keys in their lists.

7.  IANA Considerations

   IANA has nothing to do for this document.

8.  Document Considerations

   [ RFC Editor: please remove this section before publication ]

   This document is currently edited as markdown.  Minor editorial
   changes can be suggested via merge requests at
   https://gitlab.com/dkg/lamps-samples or by e-mail to the author.
   Please direct all significant commentary to the public IETF LAMPS
   mailing list: "spasm@ietf.org"

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8.1.  Document History

8.1.1.  Substantive Changes from -02 to -03

   *  Alice and Bob now each have two distinct certificates: one for
      signing, one for encryption, and public keys to match.

8.1.2.  Substantive Changes from -01 to -02

   *  PKCS#12 objects are deliberately locked with simple passphrases

8.1.3.  Substantive Changes from -00 to -01

   *  changed all three keys to use RSA instead of RSA-PSS

   *  set keyEncipherment keyUsage flag instead of dataEncipherment in
      EE certs

9.  Acknowledgements

   This draft was inspired by similar work in the OpenPGP space by
   Bjarni Runar and juga at [I-D.bre-openpgp-samples].

   Eric Rescorla helped spot issues with certificate formats.

   Sean Turner pointed to [RFC4134] as prior work.

10.  References

10.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [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,
              <https://www.rfc-editor.org/info/rfc5280>.

   [RFC5322]  Resnick, P., Ed., "Internet Message Format", RFC 5322,
              DOI 10.17487/RFC5322, October 2008,
              <https://www.rfc-editor.org/info/rfc5322>.

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   [RFC7292]  Moriarty, K., Ed., Nystrom, M., Parkinson, S., Rusch, A.,
              and M. Scott, "PKCS #12: Personal Information Exchange
              Syntax v1.1", RFC 7292, DOI 10.17487/RFC7292, July 2014,
              <https://www.rfc-editor.org/info/rfc7292>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8551]  Schaad, J., Ramsdell, B., and S. Turner, "Secure/
              Multipurpose Internet Mail Extensions (S/MIME) Version 4.0
              Message Specification", RFC 8551, DOI 10.17487/RFC8551,
              April 2019, <https://www.rfc-editor.org/info/rfc8551>.

10.2.  Informative References

   [I-D.bre-openpgp-samples]
              Einarsson, B., juga, j., and D. Gillmor, "OpenPGP Example
              Keys and Certificates", Work in Progress, Internet-Draft,
              draft-bre-openpgp-samples-01, 20 December 2019,
              <http://www.ietf.org/internet-drafts/draft-bre-openpgp-
              samples-01.txt>.

   [RFC4134]  Hoffman, P., Ed., "Examples of S/MIME Messages", RFC 4134,
              DOI 10.17487/RFC4134, July 2005,
              <https://www.rfc-editor.org/info/rfc4134>.

   [RFC7469]  Evans, C., Palmer, C., and R. Sleevi, "Public Key Pinning
              Extension for HTTP", RFC 7469, DOI 10.17487/RFC7469, April
              2015, <https://www.rfc-editor.org/info/rfc7469>.

Author's Address

   Daniel Kahn Gillmor
   American Civil Liberties Union
   125 Broad St.
   New York, NY,  10004
   United States of America

   Email: dkg@fifthhorseman.net

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