# 設定客戶受管金鑰政策
<a name="kms-key-policy-configuration"></a>

**注意**  
目前我們不支援透過主控台在字符保存庫上設定 CMK。

若要使用客戶受管金鑰，您的金鑰必須信任 Amazon Bedrock AgentCore Identity 服務主體，才能對金鑰執行加密和解密操作。設定 KMS [金鑰的金鑰政策](https://docs.aws.amazon.com/kms/latest/developerguide/key-policies.html)，如下列範例所示。撰寫此政策的 IAM 主體必須具有 KMS 金鑰的寫入存取權，並具有 `kms:PutKeyPolicy` 許可。

```
{
    "Id": "identity-service-cmk-policy",
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "BedrockAgentCoreIdentityKMSAccess",
            "Effect": "Allow",
            "Action": [
                "kms:Encrypt",
                "kms:Decrypt",
                "kms:GenerateDataKeyWithoutPlaintext"
            ],
            "Resource": "*",
            "Condition": {
                "StringLike": {
                    "kms:ViaService": "bedrock-agentcore-identity.*.amazonaws.com"
                },
                "StringEquals": {
                    "aws:ResourceAccount": "${aws:PrincipalAccount}"
                },
                "ArnLike": {
                    "kms:EncryptionContext:aws-crypto-ec:aws:bedrock-agentcore-identity:token-vault-arn": "arn:aws:bedrock-agentcore:*:*:token-vault/default"
                }
            }
        },
        {
            "Sid": "BedrockAgentCoreIdentityDescribeKeyKMSAccess",
            "Effect": "Allow",
            "Action": [
                "kms:DescribeKey"
            ],
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "aws:ResourceAccount": "${aws:PrincipalAccount}"
                },
                "StringLike": {
                    "kms:ViaService": "bedrock-agentcore-identity.*.amazonaws.com"
                }
            }
        }
    ]
}
```