Advanced Encryption Standard is an algorithm used for which of the following?

A.
Data integrity

B.
Bulk data encryption

C.
Key recovery

D.
Distribution of symmetric keys

Explanation:
B: The Advanced Encryption Standard (AES) is a data encryption standard that was developed to improve upon the previous de facto standardthe Data Encryption Standard
(DES). As a symmetric algorithm, AES is used to encrypt bulk data. Symmetric algorithms, of any kind, are used to encrypt large amounts of data (bulk), while asymmetric algorithms
are used to encrypt a small amount of data as in keys and hashing values.
A is incorrect because the Advanced Encryption Standard (AES) is an encryption algorithm and therefore provides confidentiality, not data integrity. Hashing algorithms, such as
SHA-1, MD2, MD4, MD5, and HAVAL, provide data integrity.
C is incorrect because the Advanced Encryption Standard (AES) is not used for key recovery. However, AES generates and makes use of keys, which require key recovery
procedures. Keys are at risk of being lost, destroyed, or corrupted. Backup copies should be available and easily accessible when required. If data are encrypted and then the user
accidentally loses the necessary key to decrypt it, this information would be lost forever if there were not a backup key to save the day. The application being used for cryptography
may have key recovery options, or it may require copies of the keys to be kept in a secure place.
D is incorrect because asymmetric algorithms are used to protect symmetric keys while being distributed. AES is a symmetric algorithm. In a hybrid system, the symmetric algorithm
creates a secret key that will be used to encrypt the bulk, or the message, and the asymmetric key encrypts the secret key for transmission.