SSL Labs

Analyze HTTP security headers of any website. Quick security audit.

Check if your email or phone was in a data breach. Free service by Troy Hunt, essential for security awareness.

Analyze files and URLs for malware. Scans with 70+ antivirus engines and URL/domain blocklists.

Search engine for Internet-connected devices. See what's exposed on the internet. Essential for security researchers.

Bruce Schneier's security blog. Cryptographer and security expert writing since 2004.

The legendary hacker ezine since 1985. Technical articles on security, exploitation, and hacker culture. Issue 72 in 2025.