Cybersecurity articles covering SSL certificates, HTTP security headers, password safety, data breaches and auditing your own site.
The security section covers the practical side of keeping websites, servers and accounts safe: HTTPS certificates, security headers, open ports, email authentication, password storage and the cryptography underneath. Each guide explains the risk in plain terms and shows how to check your own setup with a free tool.
Related tools include the SSL checker, the security headers checker, the port scanner and the SPF and DMARC checker.
One of the most common SSL installation errors is a certificate and private key mismatch. You install a new SSL certificate, restart your web server — and it…
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Open ports are potential entry points for attackers. Here is how to scan for open ports, what each common port does, and how to close the ones you do not need.
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Fake and disposable email addresses inflate your list, trigger spam filters, and waste resources. Here is how to verify any email address before you send.
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HTTP security headers protect your website from XSS, clickjacking, data injection and more. Here is what each header does and how to get an A grade.
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SPF, DKIM and DMARC stop spammers from sending email as your domain. Here is what each record does and how to set them up correctly.
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An expired or misconfigured SSL certificate blocks visitors and kills your SEO. Here is how to check your certificate status in under 60 seconds.
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Most passwords can be cracked in seconds. Here is what makes a password genuinely strong, and how to generate one you will never have to remember.
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How cryptographic hash functions work, MD5 vs SHA-256, why MD5 is broken for passwords, proper password hashing, and how to generate any hash free online.
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What SSL certificates are, how HTTPS encryption works, what certificate errors mean, and how to check any SSL certificate free instantly online.
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