This asymmetry cipher is based on factoring the product of two large prime numbers.
What cipher is described above?

A.
RSA

B.
SHA

C.
RC5

D.
MD5

Explanation:
RSA is based on the practical difficulty of factoring the product of two large prime numbers, the factoring
problem.
Note: A user of RSA creates and then publishes a public key based on two large prime numbers, along with an
auxiliary value. The prime numbers must be kept secret. Anyone can use the public key to encrypt a message,
but with currently published methods, if the public key is large enough, only someone with knowledge of the
prime numbers can feasibly decode the message.
https://en.wikipedia.org/wiki/RSA_(cryptosystem)