The end of the SHA-1 security algorithm, which expires in early 2016, could block access to encrypted sites on older web browsers.
When the SHA-1 security algorithm ceases to be used next year, it could make the Internet less safe for a lot of people. The algorithm offered access to encrypted sites—think more secure HTTPS websites—and was compatible with most browsers. Its successor SHA-256, however, will only be able to provide secure connections on more up-to-date browsers.