Question

Which of the following are correct?

a. To do authentication in RSA, we need to encrypt some data using a private key and decrypt it using a public key.
b. In RSA, Private key is used for the decryption.
c. In RSA, public key is used for the encryption.
d. All are correct.
e. In RSA, for each private key, there is only one unique public key.

Answer 1

In RSA, the statements provided are correct: data encrypted with the private key and decrypted with the public key is used for authentication, the private key is used for decryption, and the public key for encryption, and each private key has one unique corresponding public key.

Step-by-step explanation:

The RSA algorithm is a form of asymmetric cryptography, which involves public keys for encryption and private keys for decryption. Here's how the given statements break down:

(a) Correct. In RSA, authentication is achieved when someone encrypts with a private key, and the corresponding public key can decrypt it to verify the origin.

(b) Correct. Typically, the private key is used for decryption, especially when we talk about secure communication and ensuring that a message is confidential.

(c) Correct. For encryption and ensuring data is sent securely, the public key is used to encrypt the data which can then only be decrypted with the correct private key.

(d) All the previously mentioned statements are indeed correct in the context of RSA cryptography.

(e) Correct. In RSA cryptography, there is a mathematical relationship between the public key and the private key where each private key has one unique public key, but not necessarily vice versa, as the public key is derived from the private key.

Based on these explanations, the correct answer to the question is (d) All are correct.