Unveiling the Ultimate Guide: Learn How to Check TLS Version with Sample Code!

Table of content

  1. Introduction
  2. Understanding TLS
  3. Why Check TLS Version?
  4. Checking TLS Version
  5. Sample Code for TLS Version Checking
  6. Conclusion
  7. Additional Resources
  8. Glossary


TLS, or Transport Layer Security, is a crucial protocol for secure communication over networks. It encrypts data transferred between a client and a server, ensuring that it cannot be intercepted or tampered with by third parties. As TLS evolves over time, newer versions are introduced with stronger encryption algorithms and improved security features.

As a programmer, it is essential to know how to check which version of TLS is being used by your application. This information can help you identify potential vulnerabilities and make necessary updates to ensure the security of your application. This guide will walk you through the steps to check TLS version in various programming languages, including sample code to make the process easier.

In addition to practical applications, it's also helpful to understand the history and evolution of TLS to appreciate its significance in modern-day communication security. The article will provide a brief overview of TLS's predecessors, SSL and TLS 1.0, and how they have been replaced by newer versions due to vulnerabilities and weaknesses. By the end of this guide, you'll have a clearer understanding of TLS and know how to implement the appropriate security measures to protect your data.

Understanding TLS

Before we delve into how to check TLS version using sample code, it's important to understand what TLS is and its significance in web development.

TLS (Transport Layer Security) is a cryptographic protocol that provides secure communication over the internet. It is the successor to the SSL (Secure Socket Layer) protocol and is used to encrypt data exchange between clients and servers. TLS ensures that your data is protected from eavesdropping or tampering during transmission.

TLS works by establishing a secure connection between the client and server using a series of steps known as the "TLS Handshake". During the TLS Handshake, the client and server negotiate and agree on the encryption algorithm to be used, authenticate each other using digital certificates, and establish a secure session key for communication.

TLS is essential for the security of online transactions, such as online banking, e-commerce, and other sensitive data transfers. Without TLS, your personal and financial data could be vulnerable to interception and misuse by cybercriminals.

In summary, TLS is a critical component of secure web communication. In the next section, we'll learn how to check the version of this important protocol.

Why Check TLS Version?


Transport Layer Security (TLS) is a cryptographic protocol that provides secure communication over the internet. It is used in applications such as online banking, e-commerce, and social media platforms, to protect sensitive information from unauthorized access or tampering. However, not all versions of TLS are equally secure. Old versions, such as TLS 1.0 and TLS 1.1, are vulnerable to known security flaws, while newer versions, like TLS 1.3, have better security features and performance.

As a developer, it is essential to know which version of TLS your application uses and whether it meets the latest industry standards. By checking the TLS version, you can ensure that your application is secure and compliant with regulatory requirements. Moreover, you can avoid potential vulnerabilities and prevent attacks, such as man-in-the-middle, eavesdropping, or data breaches.

It is also worth noting that some web browsers, such as Google Chrome, Mozilla Firefox, and Microsoft Edge, have started to phase out support for insecure TLS versions. This means that users may not be able to access your website or application if it uses an outdated TLS version. Therefore, checking the TLS version is not only about security and compliance but also about user experience and accessibility.

In summary, checking the TLS version is a crucial step in developing secure and reliable applications. It helps you to stay up-to-date with industry standards, prevent security threats, and ensure a seamless user experience. In the next section, we will see how to check the TLS version in practice, using sample code.

Checking TLS Version

Transport Layer Security (TLS) is a cryptographic protocol used to secure network communication. It is essential in ensuring that sensitive data, such as passwords and financial information, is transmitted securely over the internet. As TLS technology advances, it is essential to keep up with the latest versions to maintain the highest level of security.

To check the TLS version being used in your application, you can use code snippets that will return the TLS version used in the connection. In Python, you can check the TLS version using the ssl.OPENSSL_VERSION and ssl.PROTOCOL_TLS methods. The OPENSSL_VERSION method will return the version of OpenSSL, while PROTOCOL_TLS will return the highest available protocol version.

import ssl


This code will output the version of the OpenSSL library and the highest TLS protocol version supported by the system.

It is essential to keep in mind that some protocols, such as SSLv3 and TLSv1.0, are no longer considered secure and have vulnerabilities that hackers can exploit. It is recommended to disable these protocols and only use the latest secure versions.

In conclusion, is an essential aspect of network security that should not be overlooked. By regularly checking and upgrading to the latest secure version, you can ensure that sensitive data transmitted over the internet remains protected. Using programming code snippets like the ones shown here, you can easily check the TLS version used in your application and ensure your security standards are up to date.

Sample Code for TLS Version Checking

When it comes to checking TLS versions in your code, it's important to have some sample code to guide you along the way. This code can act as a reference point and help you understand the underlying concepts you need to know.

Here is a basic code snippet to help you get started with TLS version checking:

import ssl

hostname = 'example.com'
port = 443

context = ssl.create_default_context()
with socket.create_connection((hostname, port)) as sock:
    with context.wrap_socket(sock, server_hostname=hostname) as ssock:
        print("TLS version:", ssock.version())

This code begins by importing the ssl module, which is used to create SSL/TLS connections. It then sets the hostname and port variables to the values you want to connect to.

The ssl.create_default_context() method creates a new SSL context with secure default settings. The with socket.create_connection() block creates a new socket and connects to the specified host and port.

Finally, the with context.wrap_socket() block wraps the socket in an SSL/TLS layer using the SSL context, which creates the secure connection. The ssock.version() method is used to print the TLS version used by the connection.

This sample code is just a starting point – there are many other ways to check the TLS version in your code depending on your project requirements. However, it should give you a basic understanding of how to use Python and the ssl module to check for TLS versions.


To conclude, checking TLS version is an integral part of ensuring the security and safety of online transactions and communication. SSL/TLS protocols were created to provide encryption and privacy online, but they become outdated and vulnerable as new and more advanced threats emerge. By staying up-to-date on TLS versions and implementing the latest security measures, developers and businesses can protect themselves and their customers from cyber attacks and data breaches.

We hope this guide has shed some light on the process of checking TLS version and provided some useful tips and sample code for developers. Remember to always prioritize security in your programming practices and stay informed on the latest developments in the field. With continued education and diligence, we can all do our part to create a safer and more secure online world.

Additional Resources

Learning how to check TLS version is just one aspect of programming. There are many other skills and techniques that programmers need to master in order to excel in their careers. Fortunately, there are a wealth of resources available to help beginners get started and seasoned veterans stay up-to-date.

Here are some to explore:

  • Online tutorials and courses: Websites like Codecademy, Udemy, and Coursera offer a wide range of online courses and tutorials that cover everything from beginner-level programming languages (such as Python and Java) to more advanced topics like machine learning and artificial intelligence.

  • Programming books: There are countless books available on programming, covering a wide range of topics and skill levels. Some popular titles include "Learn Python the Hard Way" by Zed A. Shaw, "Clean Code: A Handbook of Agile Software Craftsmanship" by Robert C. Martin, and "Code Complete" by Steve McConnell.

  • Programming communities and forums: Joining online communities and forums can be a great way to connect with other programmers, share tips and advice, and get feedback on your code. Some popular communities include Stack Overflow, GitHub, and Reddit's r/learnprogramming subreddit.

  • Coding challenges and competitions: Websites like HackerRank, LeetCode, and TopCoder offer coding challenges and competitions that allow programmers to test their skills and compete against others. These can be a fun way to challenge yourself and improve your coding abilities.

By exploring these , you can gain a deeper understanding of programming and continue to improve your skills and knowledge over time. Keep learning and exploring, and you'll be sure to make progress in your programming career!


Before we dive into learning how to check TLS version, it's important to understand some key terms related to programming and security. Here are a few definitions to help get you started:

  • TLS (Transport Layer Security): A cryptographic protocol designed to ensure secure communication over a network by authenticating and encrypting data. It is commonly used to secure web traffic, email, and other types of communication.
  • SSL (Secure Sockets Layer): A predecessor to TLS, SSL is a cryptographic protocol that is now largely deprecated due to security vulnerabilities.
  • Cryptography: The practice of creating and deciphering codes and ciphers to protect information from unauthorized access.
  • Hashing: A mathematical function that converts data into a fixed-length value or hash. Hashing is commonly used for password storage, as it allows for secure verification of a user's password without storing the password itself.
  • Encryption: The process of converting plain text into ciphertext to protect it from unauthorized access. Encryption can be achieved through various cryptographic algorithms and keys.
  • Decryption: The process of converting ciphertext back into plain text using a decryption key.

By understanding these terms, you'll be better equipped to understand the concepts and code related to TLS and security in programming.

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