Useful commands and links
https://httpd.apache.org/docs/2.4/mod/mod_ssl.html#sslciphersuite
openssl ciphers -v
http://www.openssl.org/docs/apps/ciphers.html
httpd -v
httpd -V
https://httpd.apache.org/docs/2.4/ssl/ssl_howto.html
openssl s_client -connect 129.123.123.112:443
yum list all
yum install nmap
nmap -p 443 --unprivileged -script ssl-enum-ciphers 129.123.123.112
https://www.tecklyfe.com/nmap-script-test-ssl-versions-cipher-suites/
SSLCipherSuite HIGH:!aNULL:!MD5
SSLCipherSuite HIGH:!aNULL:!MD5:!SSLv3:!TLSv1
https://en.wikipedia.org/wiki/Évariste_Galois
talking about GCM ciphers https://en.wikipedia.org/wiki/Galois/Counter_Mode
https://httpd.apache.org/docs/2.4/mod/mod_ssl.html#sslciphersuite
openssl ciphers -v
http://www.openssl.org/docs/apps/ciphers.html
httpd -v
httpd -V
https://httpd.apache.org/docs/2.4/ssl/ssl_howto.html
openssl s_client -connect 129.123.123.112:443
yum list all
yum install nmap
nmap -p 443 --unprivileged -script ssl-enum-ciphers 129.123.123.112
https://www.tecklyfe.com/nmap-script-test-ssl-versions-cipher-suites/
SSLCipherSuite HIGH:!aNULL:!MD5
SSLCipherSuite HIGH:!aNULL:!MD5:!SSLv3:!TLSv1
PORT STATE SERVICE
443/tcp open https
| ssl-enum-ciphers:
| SSLv3: No supported ciphers found
| TLSv1.0: No supported ciphers found
| TLSv1.1: No supported ciphers found
| TLSv1.2:
| ciphers:
| TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 - strong
| TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - strong
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_RSA_WITH_AES_256_CBC_SHA256 - strong
| TLS_RSA_WITH_AES_256_GCM_SHA384 - strong
| compressors:
| NULL
|_ least strength: strong
https://en.wikipedia.org/wiki/Évariste_Galois
talking about GCM ciphers https://en.wikipedia.org/wiki/Galois/Counter_Mode