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Submitted URL: https://docs.microsoft.com/en-us/azure/security/azure-security-disk-encryption-prerequisites
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Effective URL: https://learn.microsoft.com/en-us/azure/virtual-machines/disk-encryption-overview
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OVERVIEW OF MANAGED DISK ENCRYPTION OPTIONS
* Article
* 02/20/2024
* 7 contributors
Feedback
IN THIS ARTICLE
1. Comparison
2. Next steps
There are several types of encryption available for your managed disks,
including Azure Disk Encryption (ADE), Server-Side Encryption (SSE) and
encryption at host.
* Azure Disk Storage Server-Side Encryption (also referred to as
encryption-at-rest or Azure Storage encryption) is always enabled and
automatically encrypts data stored on Azure managed disks (OS and data disks)
when persisting on the Storage Clusters. When configured with a Disk
Encryption Set (DES), it supports customer-managed keys as well. It doesn't
encrypt temp disks or disk caches. For full details, see Server-side
encryption of Azure Disk Storage.
* Encryption at host is a Virtual Machine option that enhances Azure Disk
Storage Server-Side Encryption to ensure that all temp disks and disk caches
are encrypted at rest and flow encrypted to the Storage clusters. For full
details, see Encryption at host - End-to-end encryption for your VM data.
* Azure Disk Encryption helps protect and safeguard your data to meet your
organizational security and compliance commitments. ADE encrypts the OS and
data disks of Azure virtual machines (VMs) inside your VMs by using the
DM-Crypt feature of Linux or the BitLocker feature of Windows. ADE is
integrated with Azure Key Vault to help you control and manage the disk
encryption keys and secrets, with the option to encrypt with a key encryption
key (KEK). For full details, see Azure Disk Encryption for Linux VMs or Azure
Disk Encryption for Windows VMs.
* Confidential disk encryption binds disk encryption keys to the virtual
machine's TPM and makes the protected disk content accessible only to the VM.
The TPM and VM guest state is always encrypted in attested code using keys
released by a secure protocol that bypasses the hypervisor and host operating
system. Currently only available for the OS disk. Encryption at host may be
used for other disks on a Confidential VM in addition to Confidential Disk
Encryption. For full details, see DCasv5 and ECasv5 series confidential VMs.
Encryption is part of a layered approach to security and should be used with
other recommendations to secure Virtual Machines and their disks. For full
details, see Security recommendations for virtual machines in Azure and Restrict
import/export access to managed disks.
COMPARISON
Here's a comparison of Disk Storage SSE, ADE, encryption at host, and
Confidential disk encryption.
Expand table
Azure Disk Storage Server-Side Encryption Encryption at Host Azure Disk
Encryption Confidential disk encryption (For the OS disk only) Encryption at
rest (OS and data disks) ✅ ✅ ✅ ✅ Temp disk encryption ❌ ✅ Only supported with
platform managed key ✅ ❌ Encryption of caches ❌ ✅ ✅ ✅ Data flows encrypted
between Compute and Storage ❌ ✅ ✅ ✅ Customer control of keys ✅ When configured
with DES ✅ When configured with DES ✅ When configured with KEK ✅ When configured
with DES HSM Support Azure Key Vault Premium and Managed HSM Azure Key Vault
Premium and Managed HSM Azure Key Vault Premium Azure Key Vault Premium and
Managed HSM Does not use your VM's CPU ✅ ✅ ❌ ❌ Works for custom images ✅ ✅ ❌
Does not work for custom Linux images ✅ Enhanced Key Protection ❌ ❌ ❌ ✅
Microsoft Defender for Cloud disk encryption status* Unhealthy Healthy Healthy
Not applicable
Important
For Confidential disk encryption, Microsoft Defender for Cloud does not
currently have a recommendation that is applicable.
* Microsoft Defender for Cloud has the following disk encryption
recommendations:
* Virtual machines should encrypt temp disks, caches, and data flows between
Compute and Storage resources (Only detects Azure Disk Encryption)
* [Preview]: Windows virtual machines should enable Azure Disk Encryption or
EncryptionAtHost (Detects both Azure Disk Encryption and EncryptionAtHost)
* [Preview]: Linux virtual machines should enable Azure Disk Encryption or
EncryptionAtHost (Detects both Azure Disk Encryption and EncryptionAtHost)
NEXT STEPS
* Azure Disk Encryption for Linux VMs
* Azure Disk Encryption for Windows VMs
* Server-side encryption of Azure Disk Storage
* Encryption at host
* DCasv5 and ECasv5 series confidential VMs
* Azure Security Fundamentals - Azure encryption overview
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