¶ºÒõ¹Ý

This morning an international team of cryptanalysts urged administrators to replace their SHA-1 certificates as the risks associated SHA-1 are greater than previously expected.

The published findings are theoretical and have not yet been proven in a practical setting. While there doesn’t appear to be an immediate present danger, we strongly encourage administrators to migrate to SHA-2 as soon as feasibly possible.

The research group points out:

Collisions on SHA-1 can result in signature forgeries, but do not directly undermine the security of the Internet at large...Given the lessons learned with the MD5 full break, it is not advisable to wait until these become practically possible.

Huaxiong Wang, head of NTU's Division of Mathematical Sciences, says,Ìý"[Administrators] are also advised to migrate to SHA-2 soon, to avoid warnings for visitors when Internet browsers stop trusting SHA-1."

Thomas Peyrin, head of SYLLAB at NTU, points out,Ìý"SHA-1's successors, SHA-2 and SHA-3, are unaffected by these recent cryptanalytic advances and remain secure."ÌýThe researchers have set up a site detailing their findings:Ìý.

Administrators should consider the impact this update could have to their organization and plan for:

• Hardware compatible with SHA-2
• Server software updates supporting SHA-2
• Client software support for SHA-2
• Custom application code support for SHA-2

As part of our ongoing efforts to ensure the security of our customers, we have been proactively notifying customers of outstanding SHA-1 certificates and urging them to update to SHA-256.

Browsers and CAs have previously encouraged migration to SHA-2 by 2017, however this research encourages organizations to accelerate their plans to upgrade existing infrastructure to support SHA-2.

To identify existing SHA-1 certificates, ¶ºÒõ¹Ý has a number of tools available:

• ¶ºÒõ¹Ý Certificate Inspector
• ¶ºÒõ¹Ý SHA-1 Sunset Tool
• ¶ºÒõ¹Ý Installation Checker

¶ºÒõ¹Ý customers can update their SHA-1 certificates at no cost.

• Log in to your ¶ºÒõ¹Ý account and identify if you still have SHA-1 certificates in use.
• Re-issue your certificate and automatically receive a new SHA-2 certificate.
• Install the new SHA-2 certificate on your server.
• Use the ¶ºÒõ¹Ý Certificate UtilityÌýto confirm your SHA-256 certificate is installed.

If you are not a ¶ºÒõ¹Ý customer, please take advantage of Certificate Inspector and the SHA-1 Sunset Tool to identify current SHA-1 certificates and switch to SHA-2.

In addition, to help transition certificates to SHA-2, we have created a number of resources:ÌýSHA-2 Migration Guide.