IGCSE 03 09 2024

Read all the sentences below and select one sentence that best describes the keys used for asymmetric encryption.

• All the keys that are used in asymmetric encryption are private.

• An asymmetric encryption algorithm uses a pair of keys: a public key and a private key.

• Three public keys are used when using asymmetric encryption.

• Asymmetric and symmetric both are same

Encryption is

The process of applying an encryption algorithm to plaintext to produce ciphertext that cannot be understood (without decryption).

• True

• False

• Sentence 1: Asymmetric encryption uses keys.
  

• Sentence 2: Asymmetric encryption uses more than public keys

• Sentence 1 is correct

• Sentence 2 is correct

• Both the sentences are correct

• Both the sentences are wrong

Select the two statements about asymmetric encryption that are true.

• The private key must be used to encrypt the message.

• Asymmetric encryption uses the same key for encryption and decryption.

• Asymmetric encryption uses two keys: a public key and a private key.

• A message encrypted with a public key can only be decrypted by a related private key.

The image describes the process of _____________

• Encryption

• Decryption

The following diagram describes the process of _______

• Decryption

• Encryption