Question

There is no secret key in case of ____________

(a) Symmetric ciphers

(b) Asymmetric ciphers

(c) RSA encryption

(d) Alpha-numeric cryptography

I have been asked this question during an internship interview.

My query is from Cryptography topic in section Number Theory and Cryptography of Discrete Mathematics

Answer 1

Right answer is (a) Symmetric ciphers

The best explanation: A symmetric algorithm uses the same key to encrypt data as well as to decrypt data. For example, a symmetric algorithm will use the key to encrypt some plaintext information like a password into a ciphertext. Then, it uses again to take that ciphertext and turn it back into the password.