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When do I need to start implementing a quantum resilient cybersecurity strategy?

Nobody knows when a general-purpose quantum computer of sufficient scale to threaten our security will be available. Guesses range from a few years to many years, but it’s thought we should plan for ten years. That means we should expect the total breakdown of all currently used key exchange systems within a decade, and need to put in place a strategy early enough that will allow us to implement quantum resilient in time to protect sensitive data for its full security life. For many applications where data remains sensitive for five or more years, the time to act is really now.