What is RSA. RSA is a system employed to create the encrypted message in which the key used for encryption is different from that used to decrypt.
The RSA system has been created to answer to the necessity of a stringent security in today's society.
In previous encryption methods, in fact, there were the "pass key" between the sender and the receiver of the message. The RSA system, however, uses two keys: a public key and a private key to decrypt
The researchers then began looking for a one-way mathematical function (a function which tends to be difficult invertible) in the arithmetic clock and also the mathematicians studied the inverse operations, the multiplication of two numbers and their factorization.
The aim was reached by three U.S. researchers at MIT in 1977, Adi Shamir, Ron Rivest, Leonard Adleman.