RSA

The RSA algorithm (named after its inventors Ron Rivest, Adi Shamir et Len Aldeman, who devised the principle in 1978) is used in public key cryptography and is based on the fact that it is easy to multiply two large prime numbers but difficult to factorise the product. This is the most common example of asymmetric cryptography, still considered to be secure with current technology for sufficiently large keys (1024, 2048 or even 4096 bits).