{"id":19614,"date":"2026-08-31T11:54:33","date_gmt":"2026-08-31T09:54:33","guid":{"rendered":"https:\/\/teamwire.eu\/en\/?post_type=lexicon&#038;p=19614"},"modified":"2026-08-31T11:54:33","modified_gmt":"2026-08-31T09:54:33","slug":"transport-layer-security","status":"publish","type":"lexicon","link":"https:\/\/teamwire.eu\/en\/lexicon\/transport-layer-security\/","title":{"rendered":"Transport Layer Security (TLS)"},"content":{"rendered":"<h2>What is Transport Layer Security (TLS)?<\/h2>\n<p>TLS, short for Transport Layer Security, is a protocol that protects communication over the internet. It was developed to address the weaknesses of its predecessor, Secure Sockets Layer (SSL). Through encryption and authentication, TLS ensures that data is transmitted securely between a client and a server.<\/p>\n<p>TLS is the foundation of many security standards such as HTTPS and is used on most websites to ensure the integrity of data and the authenticity of the server.<\/p>\n<p>&nbsp;<\/p>\n<h2>How does Transport Layer Security work?<\/h2>\n<p>TLS establishes a secure connection by using a combination of asymmetric and symmetric encryption. The process begins with what is known as the TLS handshake, during which:<\/p>\n<ul>\n<li>The client and server exchange cryptographic algorithms and certificates to confirm identity.<\/li>\n<li>A session key is generated, which is used for the actual data transmission.<\/li>\n<\/ul>\n<p>Once the handshake is complete, all traffic between both parties is encrypted.<\/p>\n<p>&nbsp;<\/p>\n<h2>TLS and SSL: what is the difference?<\/h2>\n<p>SSL (Secure Sockets Layer) was the predecessor of TLS. The final version of SSL \u2014 SSL 3.0 \u2014 was replaced by TLS because SSL contained vulnerabilities that could no longer meet modern security requirements.<\/p>\n<p>TLS 1.0 was first introduced in 1999 and has since been superseded in most systems by TLS 1.3, the latest version. Both protocols share similar underlying concepts, but TLS offers better security and performance.<\/p>\n<p>&nbsp;<\/p>\n<h2>Why is Transport Layer Security important for secure online communication?<\/h2>\n<p>TLS protects users and servers from numerous threats, including:<\/p>\n<ul>\n<li>Man-in-the-middle attacks, in which data could be intercepted during transmission.<\/li>\n<li>Data manipulation, by ensuring the integrity of data throughout transfer.<\/li>\n<li>The exposure of sensitive information, as all data is encrypted.<\/li>\n<\/ul>\n<p>By using TLS, organisations can improve data security whilst ensuring the trustworthiness of their web servers.<\/p>\n<p>&nbsp;<\/p>\n<h2>What TLS versions exist and which is current?<\/h2>\n<p>The key TLS versions are:<\/p>\n<ul>\n<li><strong>TLS 1.0:<\/strong> The first version to replace SSL. Now considered outdated.<\/li>\n<li><strong>TLS 1.2:<\/strong> A robust version that remains widely in use today.<\/li>\n<li><strong>TLS 1.3:<\/strong> The latest version, released in 2018, offering greater performance and security.<\/li>\n<\/ul>\n<p>TLS 1.3 improves the TLS handshake by requiring fewer steps, making connections both faster and more secure.<\/p>\n<p>&nbsp;<\/p>\n<h2>How does a TLS handshake work?<\/h2>\n<p>The TLS handshake is the process by which a secure connection is established between the client and the server. The process involves:<\/p>\n<ol>\n<li><strong>Client Hello:<\/strong> The client sends the server a request containing supported encryption algorithms and a random value.<\/li>\n<li><strong>Server Hello:<\/strong> The server responds with a certificate and its own random value.<\/li>\n<li><strong>Key exchange:<\/strong> The server&#8217;s public key is used to generate the session key.<\/li>\n<li><strong>Encrypted communication:<\/strong> Once the handshake is complete, all data is encrypted.<\/li>\n<li><\/li>\n<\/ol>\n<h2>What encryption techniques does TLS use?<\/h2>\n<p>Transport Layer Security uses a combination of asymmetric and symmetric encryption:<\/p>\n<ul>\n<li><strong>Asymmetric encryption:<\/strong> Used during the handshake to securely exchange the session key.<\/li>\n<li><strong>Symmetric encryption:<\/strong> After the handshake, all traffic is encrypted using the session key to improve performance.<\/li>\n<\/ul>\n<p>In addition, TLS uses modern cryptographic algorithms such as AES and RSA to ensure security.<\/p>\n<p>&nbsp;<\/p>\n<h2>Advantages and disadvantages of Transport Layer Security<\/h2>\n<p><strong>Advantages:<\/strong><\/p>\n<ul>\n<li><strong>High security:<\/strong> TLS protects against data manipulation and unauthorised access.<\/li>\n<li><strong>Widespread support:<\/strong> It is supported by virtually all web browsers and web servers.<\/li>\n<li><strong>Flexibility:<\/strong> Transport Layer Security can be implemented across a variety of applications, such as email, VoIP and HTTPS.<\/li>\n<\/ul>\n<p><strong>Disadvantages:<\/strong><\/p>\n<ul>\n<li><strong>Performance demands:<\/strong> Encryption can place a burden on system resources.<\/li>\n<li><strong>Implementation complexity:<\/strong> Errors in implementation can introduce security vulnerabilities.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2>How do you implement TLS?<\/h2>\n<p>Implementing TLS involves several steps:<\/p>\n<ol>\n<li><strong>Certificate creation:<\/strong> Obtain a TLS certificate from a Certificate Authority (CA).<\/li>\n<li><strong>Server configuration:<\/strong> Install the certificate on your web server.<\/li>\n<li><strong>Protocol optimisation:<\/strong> Ensure that only secure TLS versions such as TLS 1.3 are enabled.<\/li>\n<\/ol>\n<p>Correct implementation is essential to realise the full security benefits of TLS.<\/p>\n<p>&nbsp;<\/p>\n<h2>What applications benefit from Transport Layer Security?<\/h2>\n<p>TLS is used across many areas, including:<\/p>\n<ul>\n<li><strong>HTTPS:<\/strong> For protecting websites and online shops.<\/li>\n<li><strong>VoIP:<\/strong> For securing internet telephony.<\/li>\n<li><strong>Email encryption:<\/strong> For protecting confidential communications.<\/li>\n<li><strong>Payment platforms:<\/strong> For compliance with standards such as the Payment Card Industry Data Security Standard (PCI DSS).<\/li>\n<\/ul>\n<p>TLS is an indispensable component of modern IT infrastructure.<\/p>\n<p>&nbsp;<\/p>\n<h2>Key takeaways<\/h2>\n<ul>\n<li>TLS stands for Transport Layer Security and secures online communication.<\/li>\n<li>It provides encryption, authentication and the assurance of data integrity.<\/li>\n<li>The latest version, TLS 1.3, offers greater security and improved performance.<\/li>\n<li>TLS is used in numerous applications including HTTPS, VoIP and email security.<\/li>\n<li>Correct implementation of TLS is essential for the security of your IT systems.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>What is Transport Layer Security (TLS)? TLS, short for Transport Layer Security, is a protocol that protects communication over the internet. It was developed to address the weaknesses of its predecessor, Secure Sockets Layer (SSL). Through encryption and authentication, TLS ensures that data is transmitted securely between a client and a server. TLS is the [&hellip;]<\/p>\n","protected":false},"featured_media":19628,"template":"","class_list":["post-19614","lexicon","type-lexicon","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/teamwire.eu\/en\/wp-json\/wp\/v2\/lexicon\/19614","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/teamwire.eu\/en\/wp-json\/wp\/v2\/lexicon"}],"about":[{"href":"https:\/\/teamwire.eu\/en\/wp-json\/wp\/v2\/types\/lexicon"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/teamwire.eu\/en\/wp-json\/wp\/v2\/media\/19628"}],"wp:attachment":[{"href":"https:\/\/teamwire.eu\/en\/wp-json\/wp\/v2\/media?parent=19614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}