SHA1 certificates for secure SSL/TLS communications are deprecated due to known computational vulnerabilities. To ensure secure communications, a forced deprecation sounds reasonable (i.e. refuse to connect to these). That has the side effect that it will lock out many users who are unable to use stronger hashes such as SHA256. However, if a fallback to SHA1 is provided (as Facebook is proposing), everyone will be vulnerable to SHA1 downgrade man-in-the-middle attacks.
What to do?
(Score: 0) by Anonymous Coward on Friday December 11 2015, @06:21PM
Well you might like having all your non critical communications in plaintext and monitored by a half dozen countries, but I don't.
(Score: 2, Insightful) by Ethanol-fueled on Friday December 11 2015, @09:07PM
As if Facebook isn't already happily handing them over at the drop of a hat.