Spies could be storing data to decrypt with another quantum computer

Intelligence agencies may be intercepting encrypted messages and storing them in the hope they can eventually develop a practical quantum computer to crack them, a security researcher who has worked with the united kingdom government has warned.

Although a large number of research groups are trying to create a practical quantum computer, none has yet publicly succeeded. Such a machine could quickly find the prime factors that serve as the multiplicative blocks of a number – for example, 3 and 7 will be the prime factors of 21. …

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