🛡️ Security Guides & Tools
SSL/TLS, security headers, DNSSEC, and practical security checks for websites, domains, and networks.
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DNSSEC Basics
A complete beginner's guide to DNS Security Extensions — what DNSSEC protects against, how the chain of trust works, and how to check it.
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Security Tools
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SSL Certificate Checker
Inspect a site's SSL/TLS certificate
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Security Headers Checker
Check HTTP security header configuration
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DNSSEC Lookup
Verify DNSSEC signing on a domain
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Website Security Scanner
Scan a site for common security issues
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HTTP Headers Checker
Inspect all HTTP response headers
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Password Generator
Generate strong random passwords
📚 19 GUIDES
All Security Guides
Security
Browser DNS Leaks: Secure DNS, DoH Overrides & Extensions
Security
CAA Best Practices: A Practical Guide to Certificate Authorization
Security
CAA Records Explained: Certificate Authority Authorization
Security
DNS Privacy Explained: Who Sees Your Lookups and Why It Matters
Security
DNSKEY Explained: Key Signing Keys, Zone Signing Keys & Rollover
Security
DNSSEC Basics
Security
DNSSEC Basics: A Complete Beginner's Guide
Security
DNSSEC Errors: A Diagnostic Guide to Validation Failures
Security
DNSSEC Validation Explained: How Resolvers Actually Verify Trust
Security
DS Record Explained: The Link in DNSSEC's Chain of Trust
Security
DigiCert CAA Configuration: An Enterprise Guide
Security
How to Prevent DNS Leaks: A Complete Step-by-Step Guide
Security
How to Restrict SSL Certificate Issuers With CAA
Security
Let's Encrypt CAA Configuration: A Complete Guide
Security
NSEC vs NSEC3: Proving Non-Existence in DNSSEC
Security
RRSIG Explained: DNSSEC's Actual Cryptographic Signature
Security
VPN DNS Leaks: Why They Happen and How to Fix Them
Security
What Is SSL/TLS?
Security
What Is a DNS Leak? A Complete Beginner-to-Advanced Guide