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articles/virtual-machines/disk-encryption-overview.md

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There are several types of encryption available for your managed disks, including Azure Disk Encryption (ADE), Server-Side Encryption (SSE) and encryption at host.
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- **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 using the CPU of your VMs through the use of feature [DM-Crypt](https://wikipedia.org/wiki/Dm-crypt) of Linux or the [BitLocker](https://wikipedia.org/wiki/BitLocker) feature of Windows. ADE is integrated with Azure Key Vault to help you control and manage the disk encryption keys and secrets. For full details, see [Azure Disk Encryption for Linux VMs](./linux/disk-encryption-overview.md) or [Azure Disk Encryption for Windows VMs](./windows/disk-encryption-overview.md).
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- **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](https://wikipedia.org/wiki/Dm-crypt) feature of Linux or the [BitLocker](https://wikipedia.org/wiki/BitLocker) feature of Windows. ADE is integrated with Azure Key Vault to help you control and manage the disk encryption keys and secrets. For full details, see [Azure Disk Encryption for Linux VMs](./linux/disk-encryption-overview.md) or [Azure Disk Encryption for Windows VMs](./windows/disk-encryption-overview.md).
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- **Server-Side Encryption** (also referred to as encryption-at-rest or Azure Storage encryption) automatically encrypts data stored on Azure managed disks (OS and data disks) when persisting on the Storage Clusters. For full details, see [Server-side encryption of Azure Disk Storage](./disk-encryption.md).
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- **Encryption at host** ensures that data stored on the VM host hosting your VM is encrypted at rest and flows encrypted to the Storage clusters. For full details, see [Encryption at host - End-to-end encryption for your VM data](./disk-encryption.md#encryption-at-host---end-to-end-encryption-for-your-vm-data).
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- **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 using keys an attested, secure release protocol which 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](../confidential-computing/confidential-vm-overview.md#full-disk-encryption).
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- **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](../confidential-computing/confidential-vm-overview.md#full-disk-encryption).
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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](security-recommendations.md) and [Restrict import/export access to managed disks](disks-enable-private-links-for-import-export-portal.md).
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## Comparison
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Here is a comparison of SSE, ADE, and encryption at host.
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Here's a comparison of SSE, ADE, and encryption at host.
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| | Encryption at rest (OS and data disks) | Temp disk encryption | Encryption of caches | Data flows encrypted between Compute and Storage | Customer control of keys | Does not use your VM's CPU | Works for custom images | Enhanced Key Protection | Microsoft Defender for Cloud disk encryption status |
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