<p>Associates an existing KMS alias with a different KMS key. Each alias is associated with only one KMS key at a time, although a KMS key can have multiple aliases. The alias and the KMS key must be in the same Amazon Web Services account and Region.</p> <note> <p>Adding, deleting, or updating an alias can allow or deny permission to the KMS key. For details, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/abac.html">ABAC for KMS</a> in the <i>Key Management Service Developer Guide</i>.</p> </note> <p>The current and new KMS key must be the same type (both symmetric or both asymmetric or both HMAC), and they must have the same key usage. This restriction prevents errors in code that uses aliases. If you must assign an alias to a different type of KMS key, use <a>DeleteAlias</a> to delete the old alias and <a>CreateAlias</a> to create a new alias.</p> <p>You cannot use <code>UpdateAlias</code> to change an alias name. To change an alias name, use <a>DeleteAlias</a> to delete the old alias and <a>CreateAlias</a> to create a new alias.</p> <p>Because an alias is not a property of a KMS key, you can create, update, and delete the aliases of a KMS key without affecting the KMS key. Also, aliases do not appear in the response from the <a>DescribeKey</a> operation. To get the aliases of all KMS keys in the account, use the <a>ListAliases</a> operation. </p> <p>The KMS key that you use for this operation must be in a compatible key state. For details, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/key-state.html">Key states of KMS keys</a> in the <i>Key Management Service Developer Guide</i>.</p> <p> <b>Cross-account use</b>: No. You cannot perform this operation on a KMS key in a different Amazon Web Services account. </p> <p> <b>Required permissions</b> </p> <ul> <li> <p> <a href="https://docs.aws.amazon.com/kms/latest/developerguide/kms-api-permissions-reference.html">kms:UpdateAlias</a> on the alias (IAM policy).</p> </li> <li> <p> <a href="https://docs.aws.amazon.com/kms/latest/developerguide/kms-api-permissions-reference.html">kms:UpdateAlias</a> on the current KMS key (key policy).</p> </li> <li> <p> <a href="https://docs.aws.amazon.com/kms/latest/developerguide/kms-api-permissions-reference.html">kms:UpdateAlias</a> on the new KMS key (key policy).</p> </li> </ul> <p>For details, see <a href="https://docs.aws.amazon.com/kms/latest/developerguide/kms-alias.html#alias-access">Controlling access to aliases</a> in the <i>Key Management Service Developer Guide</i>.</p> <p> <b>Related operations:</b> </p> <ul> <li> <p> <a>CreateAlias</a> </p> </li> <li> <p> <a>DeleteAlias</a> </p> </li> <li> <p> <a>ListAliases</a> </p> </li> </ul>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}