To answer this question, we need to understand the purpose of asymmetric key cryptography and how it is used.
Asymmetric key cryptography, also known as public-key cryptography, uses a pair of keys: a public key and a private key. The public key is used for encryption, while the private key is used for decryption. This type of cryptography is widely used to provide secure communication over insecure networks.
Let's go through each option to understand why it is correct or incorrect:
Option A) Encryption of data - This option is correct. One of the main purposes of asymmetric key cryptography is to encrypt data using the public key.
Option B) Access controls - This option is incorrect. Asymmetric key cryptography can be used for access controls, such as digital signatures and authentication.
Option C) Nonrepudiation - This option is incorrect. Asymmetric key cryptography can be used to provide nonrepudiation, which means that the sender of a message cannot deny sending it.
Option D) Steganography - This option is correct. Steganography is the practice of hiding information within other information, such as hiding a message within an image. Asymmetric key cryptography is not directly used for steganography.
Therefore, the correct answer is D) Steganography.