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SSL Fundamentals

Before you can monitor SSL certificates well, it helps to understand how they work. This section explains the building blocks of HTTPS in plain language: the difference between SSL and TLS, certificate types and validation levels, intermediate certificates and chains, OCSP and revocation, HSTS, SNI and Certificate Transparency. You will also find articles on where the technology is heading, from 47-day certificate lifetimes to post-quantum cryptography.

SSL Certificate Cross-Signing Explained for Administrators

SSL Certificate Cross-Signing Explained for Administrators

Administrators usually first run into SSL certificate cross-signing during an outage, when a chain that worked for …

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Hardware Security Modules for SSL Certificate Storage

Hardware Security Modules for SSL Certificate Storage

Moving TLS private keys into a hardware security module (HSM) is one of the strongest ways to …

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ACME Protocol Deep Dive – How Automated Issuance Works

ACME Protocol Deep Dive – How Automated Issuance Works

The ACME protocol is the reason most sysadmins no longer set calendar reminders for certificate renewal. If …

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Short-Lived SSL Certificates – The 47-Day Standard

Short-Lived SSL Certificates – The 47-Day Standard

Certificate lifetimes on the public web are about to get a lot shorter, and if a team …

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Understanding Intermediate SSL Certificates and Chains

Understanding Intermediate SSL Certificates and Chains

Every SSL certificate installed on a production web server is actually part of a chain, and the …

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Certificate Revocation Lists vs OCSP – Which to Use

Certificate Revocation Lists vs OCSP – Which to Use

Certificate revocation is the part of PKI that almost nobody tests until it breaks in production.

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What Is SNI and Why It Matters for SSL Configuration

What Is SNI and Why It Matters for SSL Configuration

Server Name Indication decides which SSL certificate a server hands back the instant a connection request lands, …

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How ECC Certificates Compare to RSA in Modern Setups

How ECC Certificates Compare to RSA in Modern Setups

Website owners planning a certificate renewal or a fresh TLS setup increasingly run into a choice they …

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The Impact of Quantum Computing on SSL Certificate Security

The Impact of Quantum Computing on SSL Certificate Security

The impact of quantum computing on SSL certificate security is one of the most significant long-term challenges …

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SSL vs TLS: Understanding the Difference and Why It Matters

SSL vs TLS: Understanding the Difference and Why It Matters

SSL vs TLS is one of those topics that gets glossed over constantly, yet the distinction matters …

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The Difference Between DV, OV, and EV SSL Certificates Explained

The Difference Between DV, OV, and EV SSL Certificates Explained

When choosing an SSL certificate for your website, understanding the difference between DV, OV, and EV SSL …

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What Is HSTS and Why Should You Monitor Its Configuration

What Is HSTS and Why Should You Monitor Its Configuration

HSTS (HTTP Strict Transport Security) is a critical web security mechanism that forces browsers to use HTTPS …

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Understanding Certificate Transparency and How to Monitor It

Understanding Certificate Transparency and How to Monitor It

Certificate Transparency provides a public audit trail of SSL certificate issuance, but many system administrators struggle to …

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The Beginner's Guide to SSL Certificate Types and Validation Levels

The Beginner’s Guide to SSL Certificate Types and Validation Levels

Understanding SSL certificate types and validation levels is crucial for any web administrator tasked with securing websites …

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What Is OCSP Stapling and How Does It Improve SSL Performance

What Is OCSP Stapling and How Does It Improve SSL Performance

OCSP stapling is a critical SSL optimization technique that significantly reduces website loading times by eliminating redundant …

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SSL Certificate Pinning: What It Is and Why It Matters

SSL Certificate Pinning: What It Is and Why It Matters

If you manage servers or build applications that handle sensitive data, you’ve probably worried about man-in-the-middle attacks …

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The Difference Between SSL Monitoring and Website Uptime Monitoring

The Difference Between SSL Monitoring and Website Uptime Monitoring

If you manage websites — whether your own or for clients — you’ve probably set up some …

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SSL Certificate Transparency Logs and Why They Matter

SSL Certificate Transparency Logs and Why They Matter

If you run a website, you’ve probably dealt with SSL certificates.

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Understanding SSL Certificate Validity Periods and Expiration Dates

Understanding SSL Certificate Validity Periods and Expiration Dates

If you’ve ever seen that dreaded “Your connection is not private” warning on a website, you’ve witnessed …

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