In computers "The RSA algorithm involves three steps: key generation, encryption and decryption"
Used to keep data secret from other people. I'm not an expert but I think your bank login use it ect.
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Prime numbers are used to encrypt credit cards and identify them.
There are few real-life uses for prime numbers. Nevertheless, they do have a useful purpose in some cases. For instance:Circada's only come out at time periods of 13 or 17. These are prime, and mean that a predator coming out at another value (say 4 or 6) will be less likely to catch them.Prime numbers are used to contact aliens. They are a simple but universal phenomenon that will indicate our intelligence.Prime numbers are used in encryption. It is much harder to crack a code with a big number that is the product of two large prime numbers than one which has lots of factors.
Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.
The opposite of prime numbers are composite numbers.