Which of the following two cryptography methods are used by NTFS Encrypting File System (EFS) to encrypt the data stored on a disk on a file-by-file basis?
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A. B. C. D.CB.
The NTFS Encrypting File System (EFS) is a file-level encryption feature built into the Windows operating system. It is designed to provide file-level security for sensitive data stored on disk. EFS uses a symmetric key algorithm to encrypt and decrypt files on a file-by-file basis.
The encryption key used by EFS is derived from the user's logon password, which is hashed using the NT hash algorithm. The symmetric key algorithm used by EFS is known as Advanced Encryption Standard (AES) with a 256-bit key length. AES is a widely used and highly secure encryption algorithm that has been adopted as a standard by the U.S. government.
Therefore, neither of the options A, B, C or D is the correct answer. Instead, the correct answer is E: Advanced Encryption Standard (AES).
It's important to note that while EFS uses symmetric key encryption, it also supports the use of public key certificates for key management. When EFS is used with public key certificates, the user's logon password is used to protect the private key associated with the certificate, which is used to encrypt and decrypt the symmetric key used to encrypt and decrypt files. This provides an additional layer of security for the encryption key used by EFS.