cps.letsencrypt.orgISRG CPS v2.9 - Let's Encrypt - Free SSL/TLS Certificates
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Title:ISRG CPS v2.9 - Let's Encrypt - Free SSL/TLS Certificates
Description:ISRG CPS v2.9
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Skip navigation links Documentation Get Help Donate Make a Donation Become a Sponsor Current Sponsors and Donors Get Involved About Us Let's Encrypt Internet Security Research Group (ISRG) Frequently Asked Questions (FAQ) Policy and Legal Repository Service Status Statistics Careers Contact Languages ✓ English Deutsch Español Français עברית Bahasa Indonesia 日本語 한국어 Português do Brasil Русский Srpski Svenska Tiếng Việt 简体中文 繁體中文 ISRG CPS v2.9 Internet Security Research Group (ISRG) Certification Practice Statement Version 2.9 Updated July 14, 2020 Approved by the ISRG Policy Management Authority 1. INTRODUCTION 1.1 Overview This Certification Practice Statement ("CPS") document outlines the certification services practices for Internet Security Research Group ("ISRG") Public Key Infrastructure ("ISRG PKI"). ISRG PKI services include, but are not limited to, issuing, managing, validating, revoking, and renewing Certificates in accordance with the requirements of the ISRG Certificate Policy (CP). It is recommended that readers familiarize themselves with the ISRG CP prior to reading this document. ISRG PKI services are most commonly, but not necessarily exclusively, provided under the brand/trademark "Let's Encrypt". The ISRG PKI conforms to the current version of the guidelines adopted by the Certification Authority/Browser Forum (“CAB Forum”) when issuing publicly trusted certificates, including the Baseline Requirements for the Issuance and Management of Publicly Trusted Certificates (“Baseline Requirements”). CAB Forum documents can be found at https://www.cabforum.org . If there is any conflict between this CPS and a relevant CAB Forum requirement or guideline, then the CAB Forum requirement or guideline shall take precedence. Other documents related to the behavior and control of the ISRG PKI, such as a Subscriber Agreement and Privacy Policy, can be found at https://letsencrypt.org/repository/ . Per IETF PKIX RFC 3647, this CPS is divided into nine components that cover security controls, practices, and procedures for certification services provided by the ISRG PKI. The following Certification Authorities are covered under this CPS: CA Type Distinguished Name Key Pair Type and Parameters SHA-256 Key Fingerprint Validity Period Root CA C=US, O=Internet Security Research Group, CN=ISRG Root X1 RSA, n has 4096 bits, e=65537 96:BC:EC:06:26:49:76:F3: 74:60:77:9A:CF:28:C5:A7: CF:E8:A3:C0:AA:E1:1A:8F: FC:EE:05:C0:BD:DF:08:C6 Not Before: Jun 4 11:04:38 2015 GMT, Not After: Jun 4 11:04:38 2035 GMT This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA. 1.2 Document name and identification This is the ISRG Certification Practices Statement. This document was approved for publication by the ISRG Policy Management Authority, and is made available at https://letsencrypt.org/repository/ . The following revisions have been made: Date Changes Version May 5, 2015 Original. 1.0 September 9, 2015 Added/corrected a number of policy URIs, removed LDAP as mechanism for publishing certificate information, removed administrative contact requirement for DV-SSL subscribers, removed mention of web-based revocation option, removed description of customer service center, substantial changes to all of Section 9 regarding legal matters, other minor fixes/improvements. 1.1 September 22, 2015 Updated serial number description in Section 10.3.1, DV-SSL Certificate Profiles. 1.2 March 16, 2016 Update root CRL issuance periods, disallow issuance to ‘.mil’ TLD, make NameConstraints extension optional for cross- certification profile, clarify optional NameConstraints contents, clarify that OSCP ResponderID is byname, clarify that OCSP nonce extension is not supported. 1.3 May 5, 2016 Reference CP v1.2 rather than CP v1.1. Add info about tlsFeature extension, serialNumber in Subject Distinguished Name field. 1.4 October 18, 2016 Do not require discontinuing use of a private key due to incorrect information in a certificate. Add information about issuance for Internationalized Domain Names. Add information about CA’s CAA identifying domain. Do not require discontinuing use of a private key due to expiration or revocation of a certificate. 1.5 April 13, 2017 Complete rewrite of CPS. 2.0 February 6, 2018 Remove restriction on issuing to '.mil' TLD. 2.1 March 10, 2018 Remove text stating that wildcard certificates are not supported. Clarify that wildcard validation must use DNS Change method. 2.2 May 4, 2018 Add CT fields to certificate profiles. Specify current Baseline Requirements compliance for all validations. Update certificate expiration notice text. Remove reference loops. Minor cleanup. 2.3 September 20, 2018 Define Certificate Problem Reports in Section 1.6.1. Add information about submitting Certificate Problem Reports to Section 1.5.2. 2.4 November 14, 2018 Remove user notice text from end-entity certificate profile in Section 7.1. 2.5 July 3, 2019 Minor grammatical and capitalization changes. 2.6 January 21, 2020 Make structure more exactly match RFC 3647 recommendation. Audit use of phrase No Stipulation and eliminate blank sections. Remove restriction on issuance for IP addresses in Section 7.1.5. Update lists of appropriate and prohibited certificate uses in Sections 1.4.1 and 1.4.2. Clarify annual vulnerability assessment requirements in Section 5.4.8. 2.7 May 28, 2020 Specify in Section 4.9.3 that revocations for key compromise will result in blocking of the public key for future issuance and revocation of other outstanding certificates with the key. Update description of Certificate Transparency submissions. 2.8 July 14, 2020 Clarify revocation request instructions in Section 4.9.3. 2.9 1.3 PKI participants 1.3.1 Certification authorities ISRG is a CA that provides services including, but not limited to, issuing, managing, validating, revoking, and renewing publicly-trusted Certificates. These services are performed in accordance with the requirements of the ISRG Certificate Policy (CP) and this CPS. These services are provided to the general public with exceptions as deemed appropriate by ISRG management or in accordance with relevant law. ISRG PKI services are most commonly, but not necessarily exclusively, provided under the brand/trademark "Let's Encrypt". 1.3.2 Registration authorities ISRG serves as its own RA. RA services are not performed by third parties. 1.3.3 Subscribers See definition of "Subscriber" in Section 1.6.1 Definitions. 1.3.4 Relying parties See definition of "Relying Party" in Section 1.6.1 Definitions. Relying Parties must verify the validity of certificates via CRL or OCSP prior to relying on certificates. CRL and OCSP location information is provided within certificates. 1.3.5 Other participants Other participants include CAs that cross-sign or issue subordinates to the ISRG PKI. ISRG PKI vendors and service providers with access to confidential information or privileged systems are required to operate in compliance with the ISRG CP. 1.4 Certificate usage 1.4.1 Appropriate certificate uses No stipulation. 1.4.2 Prohibited certificate uses Certificates may not be used: For any application requiring fail-safe performance such as a) the operation of nuclear power facilities b) air traffic control systems c) aircraft navigation systems d) weapons control systems e) any other system in which failure could lead to injury, death, or environmental damage. For software or hardware architectures that provide facilities for interference with encrypted communications, including but not limited to a) active eavesdropping (e.g., Man-in-the-middle attacks) b) traffic management of domain names or internet protocol (IP) addresses that the organization does not own or control. Note that these restrictions shall apply regardless of whether a relying party communicating...