RSA (Rivest–Shamir–Adleman) is a public-key cryptography algorithm that is widely used for secure data transmission. It is named after its inventors, Ronald L. Rivest, Adi Shamir, and Leonard M. Adleman, who created it in 1977.

In RSA, a public key is used to encrypt messages and a private key is used to decrypt them. The public key is made available to anyone who wants to send you a message, while the private key is kept secret and is used by you to decrypt messages that have been encrypted with your public key.

The security of RSA is based on the difficulty of factoring large composite numbers. Given an RSA key pair, it is computationally infeasible to determine the private key from the public key. This makes RSA an effective method for secure communication, as it allows people to exchange messages without having to share a secret key beforehand.

RSA is used in a wide variety of applications, including secure data transmission, digital signatures, and online banking. It is one of the most widely used public-key algorithms in the world.

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