In Catalina, Gatekeeper will also periodically check already installed apps for safety and signature validity as an added security measure. In the past, apps were checked by Gatekeeper before installation to verify the developer signatures and source code, and thereafter considered safe. If the system doesn’t find any issues with the code content or the developer’s digital signature, it marks the app as safe so that Gatekeeper knows that it has been through the security review process. Developers upload their software to Apple’s notarization service, where it is then scanned. Notarization, for its part, is an automated process by which Apple preemptively checks a developer’s apps for malicious content and code-signing issues. It does this, in part, by enforcing code signing, which is a way of using digital signatures to verify that an app’s code actually comes from the official author of the software, and has not been tampered with by malicious actors in any way. not malware or spyware disguised as a real app). Its core function is to make sure that all apps being downloaded are legitimate (i.e. What This Means: Gatekeeper is a security feature of macOS. This extends the protection from the app’s source to include automated checks for what’s in the app.” What Apple says: “Gatekeeper will ensure that all new apps you install-from the App Store or the internet-have been checked for known security issues by Apple before you run them the first time and periodically thereafter.
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