Disk encryption theory

Disk encryption is a special case of data at rest protection when the storage media is a sector-addressable device (e.g., a hard disk). This article presents cryptographic aspects of the problem. For discussion of different software packages and hardware devices devoted to this problem see disk encryption software and disk encryption hardware.

Problem definition

Disk encryption methods aim to provide three distinct properties:

  • The data on the disk should remain confidential
  • Data retrieval and storage should both be fast operations, no matter where on the disk the data is stored.
  • The encryption method should not waste disk space (i.e., the amount of storage used for encrypted data should not be significantly larger than the size of plaintext)

    • The first property requires defining an adversary from whom the data is being kept confidential. The strongest adversaries studied in the field of disk encryption have these abilities:

  • they can read the raw contents of the disk at any time;
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