The Race to Shield Secrets from Quantum Computers

An anonymous reader shared this report from Reuters:

In February, a Canadian cybersecurity firm delivered an ominous forecast to the U.S. Department of Defense. America's secrets — actually, everybody's secrets — are now at risk of exposure, warned the team from Quantum Defen5e (QD5). QD5's executive vice president, Tilo Kunz, told officials from the Defense Information Systems Agency that possibly as soon as 2025, the world would arrive at what has been dubbed 'Q-day,' the day when quantum computers make current encryption methods useless. Machines vastly more powerful than today's fastest supercomputers would be capable of cracking the codes that protect virtually all modern communication, he told the agency, which is tasked with safeguarding the U.S. military's communications.
In the meantime, Kunz told the panel, a global effort to plunder data is underway so that intercepted messages can be decoded after Q-day in what he described as 'harvest now, decrypt later' attacks, according to a recording of the session the agency later made public. Militaries would see their long-term plans and intelligence gathering exposed to enemies. Businesses could have their intellectual property swiped. People's health records would be laid bare... One challenge for the keepers of digital secrets is that whenever Q-day comes, quantum codebreakers are unlikely to announce their breakthrough. Instead, they're likely to keep quiet, so they can exploit the advantage as long as possible.
The article adds that 'a scramble is on to protect critical data. Washington and its allies are working on new encryption standards known as post-quantum cryptography... Beijing is trying to pioneer quantum communications networks, a technology theoretically impossible to hack, according to researchers...

'In a quantum communications network, users exchange a secret key or code on subatomic particles called photons, allowing them to encrypt and decrypt data. This is called quantum key distribution, or QKD.'

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