{"id":63280,"date":"2022-09-09T13:24:57","date_gmt":"2022-09-09T13:24:57","guid":{"rendered":"\/tutorials\/?p=63280"},"modified":"2025-04-23T09:42:04","modified_gmt":"2025-04-23T09:42:04","slug":"what-is-tls","status":"publish","type":"post","link":"\/uk\/tutorials\/what-is-tls\/","title":{"rendered":"What Is TLS? Understanding Transport Layer Security and How It Works"},"content":{"rendered":"

TLS or Transport Layer Security is a crucial aspect of your website. It protects users’ data from security threats like malware and denial-of-service (DoS) attacks.<\/p>

Having TLS ensures that only authorized users can access data through encryption. For example, using TLS encryption for an online store will secure your customers’ transactions by converting their sensitive data into secret code. This way, third parties will not be able to read the data.<\/p>

In this article, you will learn what TLS is, how it works, its benefits, and the difference between Secure Socket Layer (SSL) and Hypertext Transfer Protocol Secure (HTTPS) in the TLS implementation.<\/p>

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\n What Is TLS?\n <\/p>\n <\/div>\n


\nTransport Layer Security (TLS) is a cryptographic protocol that secures the connection between a web server and a web application using data encryption. It applies to all data exchanged over the network, including emails, web browsing sessions, and file transfers. As a result, hackers cannot access users’ sensitive data like login credentials and credit card numbers. <\/p><\/div>\n\n\n\n<\/p>

How Does TLS Work<\/h2>

Established by the Internet Engineering Task Force (IETF<\/a>), TLS uses encryption for the client and server to generate a secure connection between the applications. It begins when users access a secured website by specifying the TLS encryption method like the advanced encryption standard <\/strong>(AES)<\/a>.<\/p>

It works with two security layers – the TLS record protocol<\/strong> and the TLS handshake protocol<\/strong>. These protocols use symmetric and asymmetric cryptography methods to secure data transfer and communications between the clients and web servers.<\/p>

The TLS handshake protocol, for example, uses asymmetric cryptography to generate public and private keys that encrypt and decrypt data. Then, the overall process is as follows:<\/p>

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  1. The client sends a list of all TLS versions along with suggestions for a cipher suite<\/a> and generates a random number that will be used later.<\/li>\n\n\n\n
  2. The server confirms which options it will use to initiate the connection.<\/li>\n\n\n\n
  3. The server sends a TLS certificate to the client for the authentication process.<\/li>\n\n\n\n
  4. After validating the certificate, the client creates and sends a pre-master key encrypted by the server’s public key and decrypted by the server’s private key.<\/li>\n\n\n\n
  5. The client and server generate session keys using the previously generated random numbers and the pre-master key.<\/li>\n\n\n\n
  6. Both the client and server have a finished message that has been encrypted with a session key.<\/li>\n\n\n\n
  7. The TLS handshake process is finished, and both the client and server have created secure symmetric encryption.<\/li>\n<\/ol>

    Furthermore, the record protocol uses symmetric encryption to generate unique session keys for each connection during the handshake process. It also adds all data exchanged with a hash-based <\/strong>message authentication code<\/strong> (HMAC<\/a>) to verify the data authenticity.<\/p>

    Now, TLS is becoming a standard practice for most modern browsers and other applications, where it serves three purposes:<\/p>