In the 'Network Security with OpenSSL' book, it states that SSL will usually use the first cipher in a list to make the connection with. Simply we can check remote TLS/SSL connection with s_client.In these tutorials, we will look at different use cases of s_client .. ciphers - SSL cipher display and cipher list tool. These provide Strong SSL Security for all modern browsers, plus you get an A+ on the SSL Labs Test. s_lient is a tool used to connect, check, list HTTPS, TLS/SSL related information. can someone help and/or clarify exactly what the point of this command is? Specifies a list of SSL cipher suites that are allowed to be used by SSL connections. You can use SSL_CTX_set_cipher_list() to limit the list of ciphers.. #include #include // List of allowed ciphers in a colon-seperated list. There is currently no setting that controls the cipher choices used by TLS version 1.3 connections. SSL_CTX_set_cipher_list() sets the list of available ciphers for ctx using the control string str. Only connections using TLS version 1.2 and lower are affected. You'll find more details about cipher lists on this URL: maybe I've misunderstood what it does When using OpenSSL, how can I disable certain ciphers, disable certain versions (SSLv2), and perhaps how to enable only certain ciphers? SSL_set_cipher_list() sets the list of ciphers only for ssl. For OpenSSL and GnuTLS valid examples of cipher lists include 'RC4-SHA', 'SHA1+DES', 'TLSv1' and 'DEFAULT'. See the ciphers manual page in the OpenSSL package for the syntax of this setting and a list of supported values. ssl.honor-cipher-order = "enable" ssl.cipher-list = "EECDH+AESGCM: ... Lighttpd or Apache config. set_cipher_list() sets TLSv1.2 (and below) ciphers, and its success or failure should not depend on whether set_ciphersuites() has been used to setup TLSv1.3 ciphers. The format of the string is described in ciphers(1). Synopsis. Check TLS/SSL … SSL_CTX_set_cipher_list() and SSL_set_cipher_list() first appeared in SSLeay 0.5.2 and have been available since OpenBSD 2.4. NOTES The ciphers command converts textual OpenSSL cipher lists into ordered SSL cipher preference lists. It can be used as a test tool to determine the appropriate cipherlist. For OpenSSL and GnuTLS valid examples of cipher lists include 'RC4-SHA', ´SHA1+DES´, 'TLSv1' and 'DEFAULT'. Name. The default list is normally set when you compile OpenSSL. The list of ciphers is inherited by all ssl objects created from ctx. OpenSSL provides different features and tools for SSL/TLS related operations. openssl ciphers [-v] [-V] [-ssl2] [-ssl3] [-tls1] [cipherlist] Description. When I run 'openssl ciphers -v' I get a long unordered list of ciphers. The default list is normally set when you compile OpenSSL. For example, to figure out what "ordered SSL cipher preference list" a cipher list expands to, I'd normally use the openssl ciphers command line (see man page) e.g with openssl v1.0.1k I can see what that default python 2.7.8 cipher list expands to: ubuntu@server-1359495587-az-2-region-a-geo-1:~$ openssl ciphers + ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES256-GCM-SHA384 but after I run the command the cipher list order is still the same.