Configure disk encryption, Azure Disk Encryption (ADE), encryption as host, and confidential disk encryption

Encryption at Rest is a common security requirement. In Azure, organizations can encrypt data at rest without the risk or cost of a custom key management solution. Organizations have the option of letting Azure completely manage Encryption at Rest. Additionally, organizations have various options to closely manage encryption or encryption keys.

What is encryption at rest?

Encryption is the secure encoding of data used to protect confidentiality of data. The Encryption at Rest designs in Azure use symmetric encryption to encrypt and decrypt large amounts of data quickly according to a simple conceptual model:

  • A symmetric encryption key is used to encrypt data as it is written to storage.
  • The same encryption key is used to decrypt that data as it is readied for use in memory.
  • Data might be partitioned, and different keys might be used for each partition.
  • Keys must be stored in a secure location with identity-based access control and audit policies. Data encryption keys which are stored outside of secure locations are encrypted with a key encryption key kept in a secure location.

In practice, key management and control scenarios, as well as scale and availability assurances, require additional constructs. Microsoft Azure Encryption at Rest concepts and components are described below.


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