Quantum computers will become so powerful that all existing public-key cryptography protections will be quickly crackable. According to Dr. Mark Jackson of Cambridge Quantum Computing, it could be as soon as five years from now. The question is: Will we be prepared for that cryptographic day of reckoning? A few scenarios are likely: A slow, gradual, well publicized and documented plod toward the quantum crypto break. The world moved from SHA-1 to SHA-2 with enough forethought that our cryptographic protections held.”]