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Microsoft Pushes Ahead With SHA-1 Deprecation

Microsoft is speeding ahead with plans to deprecate support for older SHA1-based certificates in the upcoming Windows 10 Anniversary Update due this summer.

Microsoft is speeding ahead with plans to deprecate support for older SHA1-based certificates in the upcoming Windows 10 Anniversary Update due this summer.

By February 2017, the software giant warned that both Microsoft Edge and Internet Explorer will block SHA-1 signed TLS certificates.

This effectively means that Microsoft Edge and Internet Explorer will no longer consider websites protected with a SHA-1 certificate as secure and Microsoft said it would remove the address bar lock icon for these sites. 

“These sites will continue to work, but will not be considered secure,” Microsoft said, noting that the change will be in upcoming Windows Insider Preview builds and will be deployed broadly this summer. 

SHA1, a very popular hasing function, has been proven insecure with some calculations showing that it can be broken by 2018 or 2021 depending on the computing resources available to attackers.

Microsoft’s latest update follows a similar move by Google to force Certificate Authorities and software vendors to issue certificates based on SHA2, which is much more resistant to collision attacks.

Mozilla has also announced plans to deprecate support for SHA1 by July 2016.

Written By

Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. He is a security community engagement expert who has built programs at major global brands, including Intel Corp., Bishop Fox and GReAT. Ryan is a founding-director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world.

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