To answer this question, you need to understand the different encryption methods and their suitability for encrypting personal information. Let's go through each option to understand why it is correct or incorrect:
Option A) XOR'ing with a cryptographically secure random number - This option may provide some level of encryption, but it is not considered a strong encryption method for protecting personal information. XOR'ing with a random number can be easily reversed using the same random number, making it vulnerable to attacks.
Option B) Triple DES - This option is the correct answer. Triple DES (Data Encryption Standard) is a widely-used encryption method that provides a high level of security. It uses three sequential DES operations to encrypt the data, making it much stronger than XOR'ing with a random number.
Option C) DES-CBC 56bits - DES-CBC (Data Encryption Standard with Cipher Block Chaining) is an older encryption method that uses a 56-bit key size. While it was considered secure in the past, it is now considered weak and vulnerable to attacks. Therefore, it is not suitable for encrypting personal information.
Option D) Salted hash with a cryptographically secure random number - This option is not a proper encryption method for protecting personal information. Hashing is a one-way function that is not easily reversible, but it is not designed for encryption purposes. Additionally, using a salted hash with a random number does not provide the same level of security as a strong encryption method like Triple DES.
The correct answer is B) Triple DES. This option is correct because Triple DES is a strong encryption method that is suitable for protecting personal information.