SSL/TLS

Cryptographic protocol designed to establish an encrypted link between a server and a client (computer network).

It is widely used to secure web traffic, email, and other forms of data transmission.

Uses a handshake mechanism.

URL will start with https:// when using SSL/TLS.

Differences

SSL = Secure Sockets Layer (SSL).

TLS = Transport Layer Security (TLS).

TLS is a successor to the Secure Sockets Layer (SSL) protocol, and it is often referred to as SSL/TLS.

TLS is more modern and uses stronger encryption algorithms than SSL.

Creating SSL/TLS Certificates

Test

Pinting using curl

# server is running at the endpoint, responding with a 404 error
curl -d "param1=value1&param2=value2" -X POST http://brokenrouter.com/a20k/diff

# <html>
# <head><title>404 Not Found</title></head>
# <body>
# <center><h1>404 Not Found</h1></center>
# <hr><center>nginx/1.18.0 (Ubuntu)</center>
# </body>
# </html>

# server is not running at the endpoint
curl -d "param1=value1&param2=value2" -X POST https://brokenrouter.com/a20k/diff

# curl: (7) Failed to connect to brokenrouter.com port 443 after 40 ms: Could not connect to server

SSL and TLS

SSL/TLS

Differences

Creating SSL/TLS Certificates

Test