Experts at Netcraft discovered that nearly a million SSL SHA-1 certificates were signed with the potentially vulnerable SHA 1 hashing algorithm. The number of SHA 1 certificates issued this year is 120,000. Google Chrome already regards these certificates as insecure, resulting in more warning signals than if the sites had been served over a completely unencrypted. Google and Mozilla announced that their browsers would stop accepting SHA1-based certificates after January 1, 2017. It is time to migrate to SHA-2 and SHA-3, the unique hash algorithms approved by the National Institute of Standards and Technology.”]
Source: http://securityaffairs.co/wordpress/41271/digital-id/sha-1-certificates-hack.html