The FBI Purchased an 0-Day to Hack iPhone
A lot of folks in the industry suspected this, and this article supports the notion that the FBI purchased a 0-day vulnerability (a vulnerability not previously known in the public) to hack into the San Bernardino iPhone. Check it out at:
http://www.zdnet.com/article/fbi-hired-professional-hackers-in-san-bernardino-iphone-cracking-case/
–Kevin