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Historically, Chrome has integrated with the Root Store provided by the platform on which it is running. Chrome is in the process of transitioning certificate verification to use a common implementation on all platforms where it's under application control, namely Android, Chrome OS, Linux, Windows, and macOS. Apple policies prevent the Chrome Root Store and verifier from being used on Chrome for iOS. This will ensure users have a consistent experience across platforms, that developers have a consistent understanding of Chrome's behavior, and that Chrome will be better able to protect the security and privacy of users' connections to websites.
For CAs that already participate in other public Root Programs, such as the Mozilla Root Program, many of these requirements and processes should be familiar.
During this transition, the Chrome Root Store contains a variety of existing Certification Authorities' certificates that have historically worked in Chrome on the majority of supported platforms. This promotes interoperability on different devices and platforms, and minimizes compatibility issues. This should ensure as seamless a transition as possible for users.
In addition to compatibility considerations, CAs have been selected on the basis of past and current publicly available and verified information, such as that within the Common CA Certificate Database (CCADB).
For Certification Authorities that have not been included as part of this initial Chrome Root Store, questions can be directed to chrome-root-authority-program@google.com. Priority is given to CAs that are widely trusted on platforms that Chrome supports, in order to minimize compatibility issues.