First, lets start with some environment details: We use a Linux docker container (Docker version 17.06.0-ce, build 02c1d87) that we connect to via powershell By default, the list of allowed Cipher Suites with TLS 1.2 features around 37 different Cipher Suites, including ones that are not considered secure anymore. [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002!Functions] [HKLM\Software\Policies\Microsoft… You can view the default choice in the output from the SSL status report. The default SSL configuration uses default cipher suite negotiation. The parameter uses the OpenSSL cipher … By default, the “Not Configured” button is selected. Hello everyone, I'm currently preparing our "hardening" concept for Windows Server 2016 and have some questions about SSL Cipher Suite Order: There are three different Registry Keys where you can set a Cipher Suite Order. Two things we will be looking at is the use of insecure encrypted protocols and legacy cipher suites that are unfortunately still enabled on Windows Server 2019. How can I change the available cipher suites available to OpenSSL/Kestrel from within a Linux docker container? x) To customize the SSL/TLS cipher suite configuration for the specific application, change the "SSL cipher specification option" section from *PGM to "Define cipher specification list" and then set up the order of the cipher suites under the "Order" column. Modern compatibility Your SSL configuration will need to contain, at minimum, the following directives. It’s not very likely that you will be spending a lot of time testing cipher suite configuration using OpenSSL on the command line. The use of the Old configuration with modern versions of OpenSSL may require custom builds with support for deprecated ciphers. Basic Configuration Example. OpenSSL will ignore cipher suites it doesn't understand, so always use the full set of cipher suites below, in their recommended order. SSL Config; Configuring Cipher Suites; Configuring Cipher Suites. You can use this parameter to set an explicit list of ciphers to allow, or to disallow specific ciphers. If you’re getting errors, it means the cipher suite is either not supported or just named differently for your version of OpenSSL; for example, ECDHE needs to … Use a Short List of Secure Cipher Suites: Choose only cipher suites that offer at least 128-bit encryption, or stronger when possible. On the left hand side, expand Computer Configuration, Administrative Templates, Network, and then click on SSL Configuration Settings. A cipher suite is really four different ciphers in one, describing the key exchange, bulk encryption, message authentication and random number function. On the right hand side, double click on SSL Cipher Suite Order. The available ciphers to use to negotiate SSL connections. Click on the “Enabled” button to edit your server’s Cipher Suites. In those 12 years, the cryptography and software development community has learned a lot about improving security moving forward. While TLS 1.2 is currently the most widely-used version of the SSL/TLS protocol, TLS 1.3 (the latest version) is already supported in the current versions of most major web browsers. TLS 1.2 has been around for about 12 years. On the back end I will run an nmap script to the targeted server to enumerate supported SSL cipher suite configurations. This is because you can effectively test for only one suite at a time; testing for more than 300 cipher suites that are supported by TLS 1.2 and earlier protocol revisions would take a considerable amount of time. Side note: Time flies! You can configure the system to use a different cipher suite if your organization's security standards do not allow for the default choice. 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