Application-Layer Protocol Negotiation
Application-Layer Protocol Negotiation (ALPN) is a Transport Layer Security (TLS) extension for application layer protocol negotiation. ALPN allows the application layer to negotiate which protocol should be performed over a secure connection in a manner which avoids additional round trips and which is independent of the application layer protocols. It is used by HTTP/2.
TLS False Start was disabled in Google Chrome from version 20 (2012) onward except for websites with the Next Protocol Negotiation (NPN) extension.[1]
NPN was replaced with a reworked version, ALPN.[2] On July 11, 2014, ALPN was published as RFC 7301.
Support
ALPN is supported by these libraries.
- GnuTLS since version 3.2.0 released in May 2013.[3]
- MatrixSSL since version 3.7.1 released in December 2014.[4]
- Network Security Services since version 3.15.5 released in April 2014.[5]
- OpenSSL since version 1.0.2 released in January 2015.[6]
- LibreSSL since version 2.1.3 released in January 2015.[7]
- mbed TLS (previously PolarSSL) since version 1.3.6 released in April 2014.[8]
- SChannel since 8.1 / 2012 R2.
- s2n since its original public release in June 2015.
- wolfSSL (formerly CyaSSL) since version 3.7.0 released in October 2015. [9]
References
- ↑ Langley, Adam. "False Start's Failure (11 Apr 2012)". Retrieved 25 September 2013.
- ↑ Langley, Adam. "» NPN and ALPN". Retrieved 2 April 2013.
- ↑ "gnutls 3.2.0". Retrieved 2015-01-26.
- ↑ "MatrixSSL - News". 2014-12-04. Retrieved 2015-01-26.
- ↑ "NSS 3.15.5 release notes". Mozilla Developer Network. Mozilla. Retrieved 2015-01-26.
- ↑ "OpenSSL 1.0.2 release notes". The OpenSSL Project. The OpenSSL Project. 2015-01-22. Retrieved 2015-01-26.
- ↑ "LibreSSL 2.1.3 released". 2015-01-22. Retrieved 2015-01-26.
- ↑ "Download overview - PolarSSL". 2014-04-11. Retrieved 2015-01-26.
- ↑ "wolfSSL Release Change Log". 2015-10-26. Retrieved 2015-09-11.
External links
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- NPN Google Technical Note (published 2011)
- draft-agl-tls-nextprotoneg-04 (NPN draft) (last updated: May 2012)
- RFC 7301 "Transport Layer Security (TLS) Application-Layer Protocol Negotiation Extension"
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