What is the difference between a public key and a secret

Question

Problem

1. What is the difference between a public key and a secret key?

2. Consider an RSA cryptosystem using p = 7, q = 11 and g = 13.

a) Compute n.

(b) Compute ?.

(c) Find h

3. Consider an RSA cryptosystem using p = 23, q = 41 and g = 3. Encipher the message [847]₉₄₃.