SHA-1 Deprecation: No Browser Left Behind

After December 31, 2015, SSL certificates that use the SHA-1 hash algorithm for their signature will be declared technology non grata on the modern Internet. Google's Chrome browser has already begun displaying a warning for SHA-1 based certs that expire after 2015. Other browsers are mirroring Google and, over the course of 2016, will begin issuing warnings and eventually completely distrust connections to sites using SHA-1 signed certs. And, starting January 1, 2016, you will no longer be able to get a new SHA-1 certificate from most certificate authorities.
For the most part, that's a good thing. Prohibitively difficult to forge certificate signatures are part of what keeps encryption systems secure. As computers get faster, the risk that, for any given hashing algorithm, you can forge a certificate with the same signature increases. If an attacker can forge a certificate then they could potentially impersonate the identity of a real site and intercept its encrypted traffic or masquerade as that site.
Deprecating Old Standards
This isn't the first time we've been through this exercise. The original hashing algorithm used for most certificate signatures in the early days of the web was MD5. In 2008, researchers demonstrated they were able to Continue reading


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