A quick note on TLS certificates

📰 Medium · DevOps

Learn how TLS certificates work and how to deploy them correctly to enable HTTPS for your website or API

intermediate Published 12 Apr 2026

Action Steps

Understand the basics of TLS certificates and their role in enabling HTTPS
Identify the components of a TLS certificate, including the subject, public key, and digital signature
Deploy a TLS certificate to your website or API using a trusted certificate authority
Configure your server to use the TLS certificate and enable HTTPS
Test your TLS certificate to ensure it is working correctly and securely

Who Needs to Know This

DevOps and security teams can benefit from understanding TLS certificates to ensure secure communication for their websites and APIs

Key Insight

💡 A TLS certificate is a digital document that binds an identity to a public key, enabling secure communication over the internet

Key Takeaways

Learn how TLS certificates work and how to deploy them correctly to enable HTTPS for your website or API

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Title: A quick note on TLS certificates

URL Source: https://medium.com/@sean.lma/a-quick-note-on-tls-certificates-dba5f77770c4?source=rss------devops-5

Published Time: 2026-04-12T01:12:08Z

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# A quick note on TLS certificates. TLS certificates are commonly used in… | by Sean Ma | Apr, 2026 | Medium

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# A quick note on TLS certificates

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TLS certificates are commonly used in almost all modern websites and APIs. Most people know they “enable HTTPS”, but how they work and how to deploy them correctly are often misunderstood. This short note provides a simple explanation on this topic and hope it will be helpful.

## What are TLS certificates

At its core, a TLS (Transport Layer Security) certificate is a digital document that binds an `identity` (such as a domain name like `example.com`) to a `public key`.

A TLS certificate answers a very simple question: “When I connect to this server, how do I know it is really who it claims to be?”.

A certificate is part of a `trust chain`, not a standalone item. It contains:

* **The Subject**: Who the certificate is issued to (domain name or organization).
* **The Public Key**: Cryptographic material used to initiate secure communication.
* **The Digital Signature**: A cryptog

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A quick note on TLS certificates

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