Earlier this month, after roughly six months of deliberation and planning, Google finalised their plans for staged deprecation of Symantec certificates. The process began in March 2017 when Google had announced on the Blink mailing list that they had lost confidence about Symantec’s certificate issuance policies and practices of recent years. The initial deprecation proposal was very strict and looked like it would completely paralyse Symantec, ending with limiting their certificates to validity time of less than one year.
Over time, however, a different solution emerged and Symantec agreed to handle operations of their PKI to some other CA, selecting DigiCert for the role. In return, Google agreed to a deprecation plan that will still be difficult for Symantec, but allows them to resume issuance normally afterwards. Mozilla carried out their own investigation and decided to match Google’s actions and dates. In the final twist, Symantec decided to sell their certificate business to DigiCert.