cmek-claude-platform-on-aws changedmanage-claude/cmek-claude-platform-on-aws
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44description: Create an AWS KMS key in your AWS account and attach it to a workspace on Claude Platform on AWS.
55---
66
7If your Claude Console sidebar doesn't show **Account managed by AWS**, follow [Set up CMEK with AWS KMS](https://platform.claude.com/docs/en/manage-claude/cmek-aws-kms) instead.
7If your Claude Console sidebar doesn’t show **Account managed by AWS**, follow [Set up CMEK with AWS KMS](https://platform.claude.com/docs/en/manage-claude/cmek-aws-kms) instead.
88
99## Before you start
1010
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2424
2525 To scope them, see [IAM actions](https://platform.claude.com/docs/en/api/claude-platform-on-aws-iam-actions#encryption-keys).
2626
27* You have a workspace with no key attached, ideally a new one, because [existing data stays under Anthropic's key](https://platform.claude.com/docs/en/manage-claude/cmek-how-it-works#when-your-key-takes-effect). The key policy lists its compartment ID.
27* You have a workspace with no key attached, ideally a new one, because [existing data stays under Anthropic’s key](https://platform.claude.com/docs/en/manage-claude/cmek-how-it-works#when-your-key-takes-effect). The key policy lists its compartment ID.
2828
2929In the Claude Console, open the [Data retention](https://platform.claude.com/settings/privacy) page and select the workspace from the dropdown menu at the top. Copy the **Compartment ID** under **Encryption key**. The [Get Workspace](https://platform.claude.com/docs/en/api/organization/workspaces/retrieve) endpoint returns it as `compartment_id`.
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7676
7777Replace `<AWS_ACCOUNT_ID>` with your [AWS account ID](https://docs.aws.amazon.com/IAM/latest/UserGuide/console-account-id.html) and `<COMPARTMENT_UUID>` with the [compartment ID](https://platform.claude.com/docs/en/manage-claude/cmek-claude-platform-on-aws#prerequisites).
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79The optional `EncryptionContext` condition limits the key to the workspaces you list. Before you attach the key to another workspace, add that workspace's compartment ID and [replace the policy on the key](https://platform.claude.com/docs/en/manage-claude/cmek-aws-kms-workspaces#replace-the-key-policy). To do without the condition, delete the `Condition` block from the `AllowClaudePlatformOnAWSCrypto` statement. If you add the condition later, list every workspace the key is already attached to.
79The optional `EncryptionContext` condition limits the key to the workspaces you list. Before you attach the key to another workspace, add that workspace’s compartment ID and [replace the policy on the key](https://platform.claude.com/docs/en/manage-claude/cmek-aws-kms-workspaces#replace-the-key-policy). To do without the condition, delete the `Condition` block from the `AllowClaudePlatformOnAWSCrypto` statement. If you add the condition later, list every workspace the key is already attached to.
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8181To narrow access further, use the key policy, not IP-based restrictions. Add an `aws:SourceArn` condition to both service principal statements. This one allows every workspace in your AWS account:
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125125 </Step>
126126
127127 <Step title="Define key administrative permissions">
128 Don't select any key administrators. Your key policy already gives your AWS account full admin control. Click **Next**.
128 Don’t select any key administrators. Your key policy already gives your AWS account full admin control. Click **Next**.
129129
130130 <Frame caption="Leave key administrators empty.">
131131 
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133133 </Step>
134134
135135 <Step title="Define key usage permissions">
136 Don't select any key users, and don't add anything under **Other AWS accounts**. Your key policy already grants the access that's needed. Click **Next**.
136 Don’t select any key users, and don’t add anything under **Other AWS accounts**. Your key policy already grants the access that’s needed. Click **Next**.
137137 </Step>
138138
139139 <Step title="Edit key policy">
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151151 </Tab>
152152
153153 <Tab title="AWS CLI">
154 Save your key policy as `key-policy.json`, then create the key. Replace `<REGION>` with the key's region.
154 Save your key policy as `key-policy.json`, then create the key. Replace `<REGION>` with the key’s region.
155155
156156 ```bash
157157 aws kms create-key \
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171171
172172<Steps>
173173 <Step title="Open the encryption key settings">
174 In the Claude Console, open [Encryption keys](https://platform.claude.com/settings/privacy#encryption-keys) on the Data retention page. If the section isn't there, select **Organization** from the dropdown menu at the top.
174 In the Claude Console, open [Encryption keys](https://platform.claude.com/settings/privacy#encryption-keys) on the Data retention page. If the section isn’t there, select **Organization** from the dropdown menu at the top.
175175 </Step>
176176
177177 <Step title="Add the key">
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179179 </Step>
180180
181181 <Step title="Enter the key ARN">
182 In **KMS key ARN**, select your key. If it isn't listed, click **Enter ARN manually** and paste the ARN. Anthropic rejects alias ARNs and multi-Region keys. Click **Add**.
182 In **KMS key ARN**, select your key. If it isn’t listed, click **Enter ARN manually** and paste the ARN. Anthropic rejects alias ARNs and multi-Region keys. Click **Add**.
183183 </Step>
184184
185185 <Step title="Attach the key to a workspace">
186186 <Warning>
187 Attaching a key [can't be undone](https://platform.claude.com/docs/en/manage-claude/cmek-key-lifecycle#what-each-action-does). You can't remove it from the workspace or replace it. If the key is deleted, Anthropic can't recover the data it protects.
187 Attaching a key [can’t be undone](https://platform.claude.com/docs/en/manage-claude/cmek-key-lifecycle#what-each-action-does). You can’t remove it from the workspace or replace it. If the key is deleted, Anthropic can’t recover the data it protects.
188188 </Warning>
189189
190190 1. At the top of the Data retention page, select the workspace from the dropdown menu.
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