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How to get a perfect SSL Labs score

It is easy to get an A+ on your website. But it is a little bit hard to make a 4 parts, Certificate, Protocol Support, Key Exchange, and Cipher Strength, to be 100%.

Most of time, I got A+ rating of my site. For individual scores, the last two are 90%.

Let me break down.


It is preaty easy to get 100% here.

  • Make sure your certificate and intermediate certificate and CA are in the correct order.
  • Don’t use SHA1 for the signature algorithm. Use SHA256 instead. Actually all main CA are using SHA256 now.
  • Use a trusted CA. Do not use WoSign, StartCom.

Protocol Support

  • SSL 2.0 0%
  • SSL 3.0 80%
  • TLS 1.0 90%
  • TLS 1.1 95%
  • TLS 1.2 100%

So it is best to just use TLS 1.2.


Key Exchange

Make a strong DHE (Ephemeral Diffie-Hellman) paramaaters.

openssldhparam -out /etc/nginx/ssl/dhparam.pem 4096

It is not enough. Add following into Nginx settings.

ssl_ecdh_curve secp384r1;

Cipher Strength

  • 0 bits (no encryption) 0%
  • < 128 bits (e.g., 40, 56) 20%
  • < 256 bits (e.g., 128, 168) 80%
  • >= 256 bits (e.g., 256) 100%

So I just use 256 bit cipher suites.


Here is a test site, I tried it today, 2018-08-11. It is A+ with four 100% scores.

Here is the most important part of Nginx config file. I put them all together.

ssl_certificate /etc/nginx/ssl/;
ssl_certificate_key /etc/nginx/ssl/;
ssl_session_timeout 10m;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;

ssl_dhparam /etc/nginx/ssl/dhparam.pem;

# modern configuration. tweak to your needs.
ssl_protocols TLSv1.2;
ssl_prefer_server_ciphers on;

ssl_ecdh_curve secp384r1;

# HSTS (ngx_http_headers_module is required) (15768000 seconds = 6 months)
add_header Strict-Transport-Security max-age=15768000;

# OCSP Stapling ---
# fetch OCSP records from URL in ssl_certificate and cache them
ssl_stapling on;
ssl_stapling_verify on;


## verify chain of trust of OCSP response using Root CA and Intermediate certs
ssl_trusted_certificate /etc/nginx/ssl/;


5 Free SSL Tools You Must Try in 2016

It is 2016, your website must be SSL encrypted. Now, you have questions, how about my server and how about my SSL installation? This is the answer to this question. You must try these five free tools to test, check, analyse your https website.

No.1 SSLShopper

It is an SSL checker. Enter server hostname and click check SSL button. It will give you the brief results, including server type, certificate CA, expiration day, etc.



No.2 Symantec CryptoReport

It is a powerful tool with good design. The result is more and it is the only one can tell you how many certificates installed. Look at below, the report said, I have RSA and ECC certificates installed.  The report

The report has following information:

  • Certificate is installed correctly.
  • Certificate chain installation part.
  • Server configuration:(Server type, IP, Port, Protocols, Cipher suites, etc.)


Continue reading “5 Free SSL Tools You Must Try in 2016”

How to make the SSL site 100 in all four fields of SSLLAB Server Test

Now, a lot of web site are going to add SSL for security purpose.

Just like my site here, the SSL Report is as below.


It is A+. The score is great. When I look at it close. There are four parts. Three of them are not 100%.

Can I make it all 100?

I use one test site to do my research and try to make it 100.

OK. Let me show you why and how to do it.

Continue reading “How to make the SSL site 100 in all four fields of SSLLAB Server Test”

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