(Bloomberg) -- Days before Christmas in 2015, Juniper Networks Inc. alerted users that it had been breached. In a brief statement, the company said it had discovered “unauthorized code” in one of its network security products, allowing hackers to decipher encrypted communications and gain high-level access to customers’ computer systems.Further details were scant, but Juniper made clear the implications were serious: It urged users to download a software update “with the highest priority.”More t