Sean Turner

Photo of Sean Turner

Sean has been involved in the IETF since IETF 34 and has authored or co-authored over 40 RFCs. From March 2007 to March 2014, Sean served on the IESG as the IETF Security Area Director. Prior to being appointed to the IESG, Sean was chair of the SMIME and XMPP WGs. Currently, Sean is chair of the TLS, MLS, and RTCWEB 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 has served on the Internet Society's Board of Trustees as an IETF appointee since 2014. On the Board, he has been a member of the Compensation, Elections, Executive, Finance, Governance, Nominations, and PIR Nomination Committees as well as serving a Treasurer since 2015.


rfc3185 Oct 2001 Reuse of CMS Content Encryption Keys
rfc4809 Feb 2007 Requirements for an IPsec Certificate Management Profile
rfc5275 Jun 2008 CMS Symmetric Key Management and Distribution
rfc5480 Mar 2009 Elliptic Curve Cryptography Subject Public Key Information
rfc5750 Jan 2010 Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Certificate Handling
rfc5751 Jan 2010 Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Message Specification
rfc5752 Jan 2010 Multiple Signatures in Cryptographic Message Syntax (CMS)
rfc5753 Jan 2010 Use of Elliptic Curve Cryptography (ECC) Algorithms in Cryptographic Message Syntax (CMS)
rfc5754 Jan 2010 Using SHA2 Algorithms with Cryptographic Message Syntax
rfc5755 Jan 2010 An Internet Attribute Certificate Profile for Authorization
rfc5756 Jan 2010 Updates for RSAES-OAEP and RSASSA-PSS Algorithm Parameters
rfc5913 Jun 2010 Clearance Attribute and Authority Clearance Constraints Certificate Extension
rfc5915 Jun 2010 Elliptic Curve Private Key Structure
rfc5916 Jun 2010 Device Owner Attribute
rfc5917 Jun 2010 Clearance Sponsor Attribute
rfc5940 Aug 2010 Additional Cryptographic Message Syntax (CMS) Revocation Information Choices
rfc5958 Aug 2010 Asymmetric Key Packages
rfc5959 Aug 2010 Algorithms for Asymmetric Key Package Content Type
rfc5967 Aug 2010 The application/pkcs10 Media Type
rfc5990 Sep 2010 Use of the RSA-KEM Key Transport Algorithm in the Cryptographic Message Syntax (CMS)
rfc6031 Dec 2010 Cryptographic Message Syntax (CMS) Symmetric Key Package Content Type
rfc6032 Dec 2010 Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type
rfc6033 Dec 2010 Algorithms for Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type
rfc6149 Mar 2011 MD2 to Historic Status
rfc6150 Mar 2011 MD4 to Historic Status
rfc6151 Mar 2011 Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms
rfc6160 Apr 2011 Algorithms for Cryptographic Message Syntax (CMS) Protection of Symmetric Key Package Content Types
rfc6161 Apr 2011 Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS) Encrypted Key Package Content Type
rfc6162 Apr 2011 Elliptic Curve Algorithms for Cryptographic Message Syntax (CMS) Asymmetric Key Package Content Type
rfc6176 Mar 2011 Prohibiting Secure Sockets Layer (SSL) Version 2.0
rfc6194 Mar 2011 Security Considerations for the SHA-0 and SHA-1 Message-Digest Algorithms
rfc6268 Jul 2011 Additional New ASN.1 Modules for the Cryptographic Message Syntax (CMS) and the Public Key Infrastructure Using X.509 (PKIX)
rfc6403 Nov 2011 Suite B Profile of Certificate Management over CMS
rfc6916 Apr 2013 Algorithm Agility Procedure for the Resource Public Key Infrastructure (RPKI)
rfc7093 Dec 2013 Additional Methods for Generating Key Identifiers Values
rfc7127 Jan 2014 Characterization of Proposed Standards
rfc7169 Apr 2014 The NSA (No Secrecy Afforded) Certificate Extension
rfc7192 Apr 2014 Algorithms for Cryptographic Message Syntax (CMS) Key Package Receipt and Error Content Types
rfc7193 Apr 2014 The application/cms Media Type
rfc7748 Jan 2016 Elliptic Curves for Security
rfc7906 Jun 2016 NSA's Cryptographic Message Syntax (CMS) Key Management Attributes
rfc8208 Sep 2017 BGPsec Algorithms, Key Formats, and Signature Formats
rfc8209 Sep 2017 A Profile for BGPsec Router Certificates, Certificate Revocation Lists, and Certification Requests
rfc8226 Feb 2018 Secure Telephone Identity Credentials: Certificates
rfc8295 Jan 2018 EST (Enrollment over Secure Transport) Extensions
rfc8447 Aug 2018 IANA Registry Updates for TLS and DTLS