Final answer:
The main factors in encryption are key length, encryption algorithm, and key management. Therefore, the correct answer option is A)
Step-by-step explanation:
The correct statement regarding encryption is that establishing a policy on key management is essential for information security. Key management involves the secure generation, distribution, storage, and deletion of encryption keys. By properly managing encryption keys, organizations can ensure the confidentiality and integrity of their sensitive data.
Additionally, the statement that asymmetric-key encryption is also called public-key encryption is correct. Public-key encryption is a type of encryption that uses two different but mathematically related 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 encryption is commonly used in secure communication protocols and digital signatures.
The statement that symmetric-key encryption is fast and suitable for encrypting large data sets or messages is also correct. In symmetric-key encryption, the same key is used for both encryption and decryption. This type of encryption is efficient and suitable for encrypting large amounts of data because it requires less computational resources compared to asymmetric-key encryption.