In cryptography, RSA's an algorithm for public-key cryptography. It's the first algorithm known to be suitable for signing as well as encryption, and one of the first great advances in public key cryptography. RSA's widely used in electronic commerce protocols, and's believed to be secure given sufficiently long keys and the use of up-to-date implementations. History The algorithm was publicly described in 1978 by Ron Rivest, Adi Shamir, and Leonard Adleman at MIT; the letters RSA are the initia… (More on Rsa)