Encrypt and decrypt

1. How both confidentiality and authentication are achieved in public-key cryptography?

2. Expalin in detail about RSA algorithm.

6. Encrypt and decrypt the word ‘HELLO’ in a block cipher manner using RSA algorithm for the value p_B = 12347, q_B = 181 and e_B = 13.

1. Encrypt and decrypt the word ‘HELLO’ by processing individual letters of the given word using RSA algorithm for the value p_B = 12347, q_B = 181 and e_B = 13.

2. Explain briefly about the attacks performed on RSA.

3. Explain about knapsack cryptosystem with a suitable example.