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Sean has been involved in the IETF since IETF 34 and has authored or co-authored over 50 RFCs. From March 2007 to March 2014, Sean served on the IESG as the IETF Security Area Director. Over the years Sean has chaired the RTCWEB, SMIME, WPACK, and XMPP WGs. Currently, Sean is chair of the DULT, MLS, TLS, and WISH WGs.
He is founder of sn3rd llc, which focuses on policy, design, and implementation of security solutions, and is author of the Implementing Email and Security Tokens: Current Standards, Tools, and Practices (John Wiley and Sons, 2008).
He served on the Internet Society's Board of Trustees as an IETF appointee from 2014-2020. While on the Board, he was a member of the Compensation, Elections, Executive, Finance, Governance, Nominations, and PIR Nomination Committees as well as serving a Treasurer from 2015-2019.
He was the ISOC Board appointed member of the IETF Administrative LLC Board. He served as the LLC's Treasurer from 2019 to 2025.
Roles
| Role | Group | |
|---|---|---|
| Chair | Transport Layer Security (tls) | sean+ietf@sn3rd.com |
| Chair | Messaging Layer Security (mls) | sean+ietf@sn3rd.com |
| Chair | WebRTC Ingest Signaling over HTTPS (wish) | sean+ietf@sn3rd.com |
| Chair | Detecting Unwanted Location Trackers (dult) | sean+ietf@sn3rd.com |
| Liaison Manager | IEEE 802.11 (ieee-802-11) | sean+ietf@sn3rd.com |
| Reviewer | Security Area Directorate (secdir) | sean@sn3rd.com |
| Reviewer | ART Area Review Team (artart) | sean+ietf@sn3rd.com |
RFCs (61)
| RFC | Date | Title | Cited by |
|---|---|---|---|
| RFC 3185 | Oct 2001 | Reuse of CMS Content Encryption Keys | 1 RFC |
| RFC 4809 | Feb 2007 | Requirements for an IPsec Certificate Management Profile | 1 RFC |
| RFC 5275 | Jun 2008 | CMS Symmetric Key Management and Distribution | 3 RFCs |
| RFC 5480 | Mar 2009 | Elliptic Curve Cryptography Subject Public Key Information | 37 RFCs |
| RFC 5750 | Jan 2010 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Certificate Handling | 11 RFCs |
| RFC 5751 | Jan 2010 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Message Specification | 76 RFCs |
| RFC 5752 | Jan 2010 | Multiple Signatures in Cryptographic Message Syntax (CMS) | 6 RFCs |
| RFC 5753 | Jan 2010 | Use of Elliptic Curve Cryptography (ECC) Algorithms in Cryptographic Message Syntax (CMS) | 19 RFCs |
| RFC 5754 | Jan 2010 | Using SHA2 Algorithms with Cryptographic Message Syntax | 21 RFCs |
| RFC 5755 | Jan 2010 | An Internet Attribute Certificate Profile for Authorization | 15 RFCs |
| RFC 5756 | Jan 2010 | Updates for RSAES-OAEP and RSASSA-PSS Algorithm Parameters | 3 RFCs |
| RFC 5913 | Jun 2010 | Clearance Attribute and Authority Clearance Constraints Certificate Extension | 2 RFCs |
| RFC 5915 | Jun 2010 | Elliptic Curve Private Key Structure | 4 RFCs |
| RFC 5916 | Jun 2010 | Device Owner Attribute | 1 RFC |
| RFC 5917 | Jun 2010 | Clearance Sponsor Attribute | 1 RFC |
| RFC 5940 | Aug 2010 | Additional Cryptographic Message Syntax (CMS) Revocation Information Choices | 1 RFC |
| RFC 5958 | Aug 2010 | Asymmetric Key Packages | 24 RFCs |
| RFC 5959 | Aug 2010 | Algorithms for Asymmetric Key Package Content Type | 7 RFCs |
| RFC 5967 | Aug 2010 | The application/pkcs10 Media Type | 4 RFCs |
| RFC 5990 | Sep 2010 | Use of the RSA-KEM Key Transport Algorithm in the Cryptographic Message Syntax (CMS) | 3 RFCs |
| RFC 6031 | Dec 2010 | Cryptographic Message Syntax (CMS) Symmetric Key Package Content Type | 10 RFCs |
| RFC 6032 | Dec 2010 | Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type | 8 RFCs |
| RFC 6033 | Dec 2010 | Algorithms for Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type | 5 RFCs |
| RFC 6149 | Mar 2011 | MD2 to Historic Status | 4 RFCs |
| RFC 6150 | Mar 2011 | MD4 to Historic Status | 3 RFCs |
| RFC 6151 | Mar 2011 | Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms | 37 RFCs |
| RFC 6160 | Apr 2011 | Algorithms for Cryptographic Message Syntax (CMS) Protection of Symmetric Key Package Content Types | 5 RFCs |
| RFC 6161 | Apr 2011 | Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type | 4 RFCs |
| RFC 6162 | Apr 2011 | Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS) Asymmetric Key Package Content Type | 5 RFCs |
| RFC 6176 | Mar 2011 | Prohibiting Secure Sockets Layer (SSL) Version 2.0 | 7 RFCs |
| RFC 6194 | Mar 2011 | Security Considerations for the SHA-0 and SHA-1 Message-Digest Algorithms | 27 RFCs |
| RFC 6268 | Jul 2011 | Additional New ASN.1 Modules for the Cryptographic Message Syntax (CMS) and the Public Key Infrastructure Using X.509 (PKIX) | 16 RFCs |
| RFC 6403 | Nov 2011 | Suite B Profile of Certificate Management over CMS | 3 RFCs |
| RFC 6916 | Apr 2013 | Algorithm Agility Procedure for the Resource Public Key Infrastructure (RPKI) | 9 RFCs |
| RFC 7093 | Dec 2013 | Additional Methods for Generating Key Identifiers Values | 1 RFC |
| RFC 7127 | Jan 2014 | Characterization of Proposed Standards | 1 RFC |
| RFC 7169 | Apr 2014 | The NSA (No Secrecy Afforded) Certificate Extension | 1 RFC |
| RFC 7192 | Apr 2014 | Algorithms for Cryptographic Message Syntax (CMS) Key Package Receipt and Error Content Types | 2 RFCs |
| RFC 7193 | Apr 2014 | The application/cms Media Type | 3 RFCs |
| RFC 7748 | Jan 2016 | Elliptic Curves for Security | 32 RFCs |
| RFC 7906 | Jun 2016 | NSA's Cryptographic Message Syntax (CMS) Key Management Attributes | 1 RFC |
| RFC 8208 | Sep 2017 | BGPsec Algorithms, Key Formats, and Signature Formats | 8 RFCs |
| RFC 8209 | Sep 2017 | A Profile for BGPsec Router Certificates, Certificate Revocation Lists, and Certification Requests | 8 RFCs |
| RFC 8226 | Feb 2018 | Secure Telephone Identity Credentials: Certificates | 13 RFCs |
| RFC 8295 | Jan 2018 | EST (Enrollment over Secure Transport) Extensions | 1 RFC |
| RFC 8447 | Aug 2018 | IANA Registry Updates for TLS and DTLS | 12 RFCs |
| RFC 8550 | Apr 2019 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Certificate Handling | 5 RFCs |
| RFC 8551 | Apr 2019 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message Specification | 14 RFCs |
| RFC 8608 | Jun 2019 | BGPsec Algorithms, Key Formats, and Signature Formats | |
| RFC 8635 | Aug 2019 | Router Keying for BGPsec | 1 RFC |
| RFC 8813 | Aug 2020 | Clarifications for Elliptic Curve Cryptography Subject Public Key Information | |
| RFC 9001 | May 2021 | Using TLS to Secure QUIC | 17 RFCs |
| RFC 9152 | Apr 2022 | Secure Object Delivery Protocol (SODP) Server Interfaces: NSA's Profile for Delivery of Certificates, Certificate Revocation Lists (CRLs), and Symmetric Keys to Clients | |
| RFC 9191 | Feb 2022 | Handling Large Certificates and Long Certificate Chains in TLS-Based EAP Methods | 2 RFCs |
| RFC 9295 | Sep 2022 | Clarifications for Ed25519, Ed448, X25519, and X448 Algorithm Identifiers | |
| RFC 9310 | Jan 2023 | X.509 Certificate Extension for 5G Network Function Types | |
| RFC 9336 | Dec 2022 | X.509 Certificate General-Purpose Extended Key Usage (EKU) for Document Signing | |
| RFC 9646 | Oct 2024 | Conveying a Certificate Signing Request (CSR) in a Secure Zero-Touch Provisioning (SZTP) Bootstrapping Request | |
| RFC 9662 | Oct 2024 | Updates to the Cipher Suites in Secure Syslog | |
| RFC 9690 | Feb 2025 | Use of the RSA-KEM Algorithm in the Cryptographic Message Syntax (CMS) | |
| RFC 9712 | Jan 2025 | IETF Meeting Venue Requirements Review |
Active Internet-Drafts (11)
- draft-ietf-lamps-pkcs8-prikeyinfo-contenttypes
- draft-ietf-stir-certificates-ocsp
- draft-ietf-lamps-kyber-certificates
- draft-ietf-tls-rfc8447bis
- draft-ietf-lamps-rfc5274bis
- draft-ietf-lamps-rfc5273bis
- draft-ietf-lamps-rfc5272bis
- draft-ietf-lamps-dilithium-certificates
- draft-ietf-lamps-rfc5019bis
- draft-ietf-netconf-over-tls13
- draft-ietf-pce-pceps-tls13
Expired Internet-Drafts (59)
- draft-ietf-lamps-key-attestation-ext
- draft-uta-ciphersuites-in-sec-syslog
- draft-turner-lamps-nist-pqc-kem-certificates
- draft-turner-ccmib
- draft-turner-lamps-adding-sha3-to-pkix
- draft-ietf-sidr-bgpsec-overview
- draft-ietf-pkix-roadmap
- draft-turner-thecurve25519function
- draft-turner-cmc-serverkeygeneration
- draft-peterson-stir-certificates
- draft-cooper-ietf-privacy-requirements
- draft-handt-sacm-alternate-architecture
- draft-handt-sacm-asset-identifiers
- draft-turner-vcard-smimecaps
- draft-dang-turner-sha-512-224-256
- draft-turner-rsvp-auth-update
- draft-ymbk-rpki-rtr-keys
- draft-tschofenig-secure-the-web
- draft-ymbk-ta-publication
- draft-harkins-application-csrattrs-media-type
- draft-turner-sodp
- draft-turner-dnssec-centric-pki
- draft-hildebrand-dna
- draft-ietf-smime-rfc3278-update