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Modern encryption methods use prime numbers for keys.

Prime numbers are used in multiple shops for seeking out the price of many objects, for example, if a load of 'KitKats' were being delivered, and the shop was a particular perfectionist and wanted the same amount of KitKats in every box, they would count them up, and if their total was a Prime number, they would have a problem on their hand

One big use in in coding information like credit card numbers on the computer so that they remain private. One of the first algorithms that did this was called RSA. The ones that are used now are much more sophisticated.

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Q: What are prime numbers used for?
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