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RSA encryption is a public key encryption technology developed by RSA Data Security, which licenses the algorithm technologies and also sells the development kits. RSA is built into many common software products, including Microsoft's Internet Explorer.
A person using RSA encryption finds the product of two large prime numbers, which are kept confidential. With additional mathematical operations, two sets of numbers - public and private keys - are developed. Once the public and private keys are derived, the large numbers can be discarded.