Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Guidelines for the Selection, Configuration, and Use of Transport Layer Security (TLS) Implementations



Kerry A. McKay, David A. Cooper


Transport Layer Security (TLS) provides mechanisms to protect data during electronic dissemination across the Internet. This Special Publication provides guidance to the selection and configuration of TLS protocol implementations while making effective use of Federal Information Processing Standards (FIPS) and NIST-recommended cryptographic algorithms. It requires that TLS 1.2 configured with FIPS-based cipher suites be supported by all government TLS servers and clients and requires support for TLS 1.3 by January 1, 2024. This Special Publication also provides guidance on certificates and TLS extensions that impact security.
Special Publication (NIST SP) - 800-52 Rev. 2
Report Number
800-52 Rev. 2


information security, network security, SSL, TLS, Transport Layer Security
Created August 29, 2019, Updated October 31, 2019