[doc] update ssl.cipher-list recommendation

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2918 152afb58-edef-0310-8abb-c4023f1b3aa9

doc/config/lighttpd.conf

@@ -403,15 +403,23 @@ server.upload-dirs = ( "/var/tmp" )
 ##     ssl.engine                  = "enable"
 ##     ssl.pemfile                 = "/etc/ssl/private/www.example.com.pem"
 ##     #
-##     # Mitigate BEAST attack:
+##     # (Following SSL/TLS Deployment Best Practices 1.3 / 17 September 2013 from:
+##     # https://www.ssllabs.com/projects/best-practices/index.html)
+##     # - BEAST is considered mitigaed on client side now, and new weaknesses have been found in RC4,
+##     #   so it is strongly advised to disable RC4 ciphers (HIGH doesn't include RC4)
+##     # - It is recommended to disable 3DES too (although disabling RC4 and 3DES breaks IE6+8 on Windows XP,
+##     #   so you might want to support 3DES for now - just remove the '!3DES' parts below).
+##     # - The examples below prefer ciphersuites with "Forward Secrecy" (and ECDHE over DHE (alias EDH)), remove '+kEDH +kRSA'
+##     #   if you don't want that.
+##     # - SRP and PSK are not supported anyway, excluding those just keeps the list smaller (easier to review)
+##     # Check your cipher list with: openssl ciphers -v '...' (use single quotes as your shell won't like ! in double quotes)
 ##     #
-##     # A stricter base cipher suite. For details see:
-##     # http://blog.ivanristic.com/2011/10/mitigating-the-beast-attack-on-tls.html
-##     #
-##     ssl.cipher-list             = "ECDHE-RSA-AES256-SHA384:AES256-SHA256:RC4-SHA:RC4:HIGH:!MD5:!aNULL:!EDH:!AESGCM"
+##     # If you know you have RSA keys (standard), you can use:
+##     ssl.cipher-list             = "aRSA+HIGH !3DES +kEDH +kRSA !kSRP"
+##     # The more generic version (without the restriction to RSA keys) is
+##     # ssl.cipher-list           = "HIGH !aNULL !3DES +kEDH +kRSA !kSRP !kPSK"
 ##     #
 ##     # Make the server prefer the order of the server side cipher suite instead of the client suite.
-##     # This is necessary to mitigate the BEAST attack (unless you disable all non RC4 algorithms).
 ##     # This option is enabled by default, but only used if ssl.cipher-list is set.
 ##     #
 ##     # ssl.honor-cipher-order = "enable"