Whole Disk Encryption Explained

PCI Guru

There are a lot of security professionals and lay people that seem to believe that encryption is encryption and that is simply not the case. Worse yet, vendors play into this misconception and obfuscate the issue with lots of words and phrases discussing seemingly complicated encryption key management procedures and the like that are actually meaningless when it comes to protecting data on running systems. As a result, it is time to clarify all of this misunderstanding.

First things first, we need to discuss how whole disk encryption works. As its name implies, whole disk encryption encrypts an entire disk drive. When a file on the whole disk encrypted drive is accessed, the encryption solution decrypts the file necessary using the decryption key provided at system startup and the rest of the drive remains encrypted. That way if a system failure occurs or the system is shutdown deliberately, the drive…

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