Cryptographic issue when a controller receives an LMP start encryption command under unexpected conditions.
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The DNA test for websites.

Google’s Safe Browsing technology examines billions of URLs per day looking for unsafe websites. Every day, we discover thousands of new unsafe sites, many of which are legitimate websites that have been compromised. When we detect unsafe sites, we show warnings on Google Search and in web browsers. You can search to see whether a website is currently dangerous to visit.

Explore more than 866 billion web pages saved over time.

The Mozilla Observatory has helped over 240,000 websites by teaching developers, system administrators, and security professionals how to configure their sites safely and securely.

Web Application Security Researcher

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Enter a domain or URL into the search engine to view details about its current URL categories. To request recategorization of this website, click Request Change below the search results.

Follow the adventures of Certificat as she explains why HTTPS is crucial for the future of the internet and how it all works together in a comic.

Website scanner for suspicious and malicious URLs

Latest web security & vulnerabilities, product releases, product docs and faq blogs.

Learn to secure the web one step at a time, with our practical, interactive learning materials. Covering the latest research, and completely free.

Websites contain several different types of information. Some of it is non-sensitive, for example the copy shown on the public pages. Some of it is sensitive, for example customer usernames, passwords, and banking information, or internal algorithms and private product information.

Web technology information profiler tool. Find out what a website is built with.

The issue tracker for Firefox and other Mozilla products.

The web application vulnerabilities index lists vulnerabilities according to its severity and is classified by the compliance standard it falls under.

Whether you've just started your hacker journey or you're just looking for some new challenges, the Hacker101 CTF has something for you.

A community for sharing and discussing novel web security research.