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Disk encryption is a technology which protects information by converting it into unreadable code that cannot be deciphered easily by unauthorized people. Disk encryption uses disk encryption software or hardware to encrypt every bit of data that goes on a disk or disk volume. Disk encryption prevents unauthorized access to data storage. Expressions ''full disk encryption (FDE)'' or ''whole disk encryption'' often signify that everything on disk is encrypted – including the programs that can encrypt bootable operating system partitions – when part of the disk is necessarily not encrypted. On systems that use a master boot record (MBR), that part of the disk remains non encrypted. Some hardware-based full disk encryption systems can truly encrypt an entire boot disk, including the MBR. == Transparent encryption == Transparent encryption, also known as real-time encryption and on-the-fly encryption (OTFE), is a method used by some disk encryption software. "Transparent" refers to the fact that data is automatically encrypted or decrypted as it is loaded or saved. With transparent encryption, the files are accessible immediately after the key is provided, and the entire volume is typically mounted as if it were a physical drive, making the files just as accessible as any unencrypted ones. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. The entire file system within the volume is encrypted (including file names, folder names, file contents, and other meta-data). 〔("Truecrypt User Guide" )〕 To be transparent to the end user, transparent encryption usually requires the use of device drivers to enable the encryption process. Although administrator access rights are normally required to install such drivers, encrypted volumes can typically be used by normal users without these rights .〔("LibreCrypt Installation Guide" )〕 In general, every method in which data is transparently encrypted on write and decrypted on read can be called transparent encryption. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「disk encryption」の詳細全文を読む スポンサード リンク
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