Every time you see the padlock icon in your browser’s address bar, a quiet security check has just taken place. Your browser didn’t simply take the website’s word for who it is — it verified a chain of digital certificates, link by link, before trusting the site. That chain is the SSL certificate chain —…
A URL is the address of a page, image, file, or other resource on the internet — the text you type into your browser’s address bar to go somewhere online. Every page you have ever opened had one, whether you noticed it or not. Learn to read a URL and you can tell where a…
You downloaded a file, tried to open or install it, and instead got a message about a “checksum error” or a “checksum mismatch.” In plain words, your computer checked the file, found that it doesn’t match what it is supposed to look like, and refused to trust it. The good news: this is usually fixable…
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