Prefer specific key exchange algorithms for TLS
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Policy overview

Key metadata and intent for this policy.

Category
Microsoft Edge > Cryptography compliance policies
Supported on
Microsoft Edge version 146, Windows 7 or later

Supported OS tags: Windows7

This policy configures Microsoft Edge to prioritize certain key agreement algorithms (supported groups) in TLS 1.3 based on compliance requirements. If you set this policy to 'cnsa2', Microsoft Edge prefers the algorithms required for the Commercial National Security Algorithm Suite 2.0 (CNSA 2.0). If you leave this policy unset or set it to 'default', the browser uses its standard key exchange order. This policy does not guarantee negotiation of a specific algorithm. It is designed to help server operators distinguish clients with compliance requirements and apply higher-strength, non-default algorithms only when appropriate. This policy applies only to TLS 1.3 and QUIC. The default cryptography used by Microsoft Edge already provides strong security, but enabling this policy may reduce performance when accessing websites. Policy options mapping: * CNSA2.0 (cnsa2) = Prefer key exchange methods satisfying the requirements of CNSA 2.0 * Default (default) = Use Microsoft Edge's default supported groups Use the preceding information when configuring this policy. Example value: cnsa2

Internal name
PreferSlowKexAlgorithms
Policy ID
d8c102605282
Elements
1

Registry values

How enabled and disabled states update the registry.

No explicit registry values are set for enabled or disabled states.

Policy elements

Inputs and configuration options exposed by this policy.

ScopeElementTypeRegistry mappingConstraints & behaviorCopy
Prefer specific key exchange algorithms for TLS
ID PreferSlowKexAlgorithms
enum
Path
Software\Policies\Microsoft\Edge
Value name
PreferSlowKexAlgorithms
Type
REG_SZ
Options: Prefer key exchange methods satisfying the requirements of CNSA 2.0 (cnsa2), Use Microsoft Edge's default supported groups (default)
Prefer specific key exchange algorithms for TLS
Both · Type enum
Registry mapping
Path
Software\Policies\Microsoft\Edge
Value name
PreferSlowKexAlgorithms
Type
REG_SZ
Details
Options: Prefer key exchange methods satisfying the requirements of CNSA 2.0 (cnsa2), Use Microsoft Edge's default supported groups (default)