This blog post http://blog.ivanristic.com/2014/09/sha1-deprecation-what-you-need-to-know.html http://blog.ivanristic.com/2014/09/sha1-deprecation-what-you... gi

This blog post http://blog.ivanristic.com/2014/09/sha1-deprecation-what-you-need-to-know.html http://blog.ivanristic.com/2014/09/sha1-deprecation-what-you... gives some background for this change and discusses dual-certificate deployment as a way to remain warning-free in Chrome and continue to support older (SHA1 only) clients.