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THE CRYPTOGRAPHY GUIDE: RSA. RSA RSA is a public key algorithm invented by Rivest, Shamir and Adleman. The key used for encryption is different from (but related to) the key used for decryption.The algorithm is based on modular exponentiation.hen talking of key lengths in connection with RSA, what is meant is the modulus length. An algorithm that uses different keys for encryption and decryption is said to be asymmetric. Anybody knowing the public key can use it to create encrypted messages, but only the owner of the secret key can decrypt them.
RSA is one of the first public-key cryptosystems and is widely used for secure data transmission. In such a cryptosystem, the encryption key is public and it is different from the decryption key which is kept secret. In RSA, this asymmetry is based on the practical difficulty of the factorization of the product of two large prime numbers, the factoring problem. The acronym RSA is made of the initial letters of the surnames of Ron Rivest, Adi Shamir, and Leonard Adleman, who first publicly desc