Architecting Recording Encryption Key Management with Customer-Managed Key (BYOK) Support

How-To-Articles
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Architecting Recording Encryption Key Management with Customer-Managed Key (BYOK) Support

What This Guide Covers

This guide details the architectural implementation of Bring Your Own Key (BYOK) for media recording encryption in Genesys Cloud CX. You will configure AWS KMS Customer Managed Keys (CMKs) to encrypt sensitive voice and screen recordings, establish the necessary IAM trust policies, and integrate these keys into the Genesys Cloud recording management infrastructure. The outcome is a secure, compliant recording storage environment where the customer retains full control over encryption keys, enabling key rotation, revocation, and audit capabilities that meet strict regulatory requirements such as HIPAA, PCI-DSS, and GDPR.

Prerequisites, Roles & Licensing

  • Licensing Tier: Genesys Cloud CX 1, CX 2, or CX 3. BYOK is available across all tiers but requires specific administrative permissions.
  • Genesys Cloud Permissions:
    • Recording > Recording > Edit
    • Admin > Security > Security > Edit
    • Admin > Admin > Admin > Edit (for Organization ID retrieval)
  • AWS IAM Permissions:
    • iam:CreateRole
    • iam:PutRolePolicy
    • kms:CreateKey
    • kms:CreateAlias
    • kms:PutKeyPolicy
    • kms:EnableKey
  • External Dependencies:
    • An active AWS account with administrative access.
    • The Genesys Cloud Organization ID (OID).
    • The specific AWS Region where the Genesys Cloud tenant is hosted (e.g., us-east-1, eu-west-1). Note: Genesys Cloud regions map to specific AWS regions. You must confirm the hosting region for your specific deployment via the Genesys Cloud Admin > Admin > Settings > Organization Details.

The Implementation Deep-Dive

1. Establishing the AWS KMS Customer Managed Key (CMK)

The foundation of BYOK is the creation of a Customer Managed Key (CMK) within AWS Key Management Service (KMS). Genesys Cloud does not store the master key material; instead, it uses the CMK to encrypt data keys that subsequently encrypt the recording payloads. This envelope encryption model ensures performance while maintaining strict access controls.

Step 1.1: Create the CMK in AWS Console

Navigate to the AWS KMS console in the region corresponding to your Genesys Cloud deployment. Select Customer managed keys. Click Create key.

  1. Key Type: Select Symmetric.
  2. Key usage: Select Encrypt and decrypt.
  3. Key spec: Select AES_256.
  4. Key Alias: Assign a descriptive alias, such as alias/genesys-recording-cmk-[OrgID]. The alias is critical for future rotation and identification.

The Trap: Do not enable Auto-rotate key at this stage if you intend to manage rotation via external audit processes. While auto-rotation is secure, it can complicate forensic investigations if a recording from a specific time period needs to be decrypted using a historical key version. For strict compliance environments, manual rotation with documented change logs is often preferred over silent auto-rotation. If you enable auto-rotation, ensure your key policy allows the necessary permissions for the rotation role.

Step 1.2: Configure the Key Policy

The Key Policy is the root access control document for the CMK. It must grant Genesys Cloud the ability to use the key for encryption and decryption operations.

Click Next to reach the Key Policy configuration. You must modify the default policy to include a statement that allows the Genesys Cloud service principal to use the key. The exact service principal identifier depends on the region. For the us-east-1 region, the principal is typically arn:aws:iam::123456789012:role/GenesysCloudKMSRole (note: this is a placeholder; see Step 1.3 for the actual trust relationship).

However, the most robust approach is to use an IAM Role as the principal. Genesys Cloud provides a specific ARN format for its service role. You must add a statement similar to the following JSON structure to your Key Policy:

{
  "Sid": "AllowGenesysCloudAccess",
  "Effect": "Allow",
  "Principal": {
    "AWS": "arn:aws:iam::<GENESYS_AWS_ACCOUNT_ID>:role/<GENESYS_SERVICE_ROLE>"
  },
  "Action": [
    "kms:Encrypt",
    "kms:Decrypt",
    "kms:ReEncrypt*",
    "kms:GenerateDataKey*",
    "kms:DescribeKey"
  ],
  "Resource": "*"
}

Architectural Reasoning: We explicitly list kms:GenerateDataKey* because Genesys Cloud uses envelope encryption. It generates a unique data key for each recording session or batch, encrypts that data key with the CMK, and then uses the data key to encrypt the actual audio/video payload. This allows for efficient decryption of individual recordings without exposing the master CMK to the data plane.

The Trap: A common misconfiguration is restricting the Resource field to only the specific bucket ARN. KMS operations in this context are tied to the key itself, not the S3 bucket directly in the policy statement. Restricting resources incorrectly can cause AccessDenied errors during recording creation. Keep the Resource as * within the KMS key policy, and enforce bucket-level security via S3 Bucket Policies and IAM roles.

2. Configuring the IAM Trust Relationship

Genesys Cloud operates as a third-party service. To access the CMK, AWS requires a trust relationship that explicitly allows the Genesys Cloud account to assume the necessary permissions. This is achieved by creating an IAM Role in your AWS account that Genesys Cloud can assume, or by directly granting permission to the Genesys Cloud service principal in the KMS Key Policy.

The recommended approach for BYOK is to grant permissions directly to the Genesys Cloud service principal in the KMS Key Policy (as shown in Step 1.2) rather than creating a cross-account IAM role, unless your organization mandates cross-account access via IAM Roles for additional audit logging.

If your security policy requires an IAM Role:

  1. Create an IAM Role named GenesysCloudKMSAccessRole.
  2. Set the Trusted Entity to Another AWS account.
  3. Enter the Genesys Cloud AWS Account ID. This ID is provided by Genesys Cloud Support or can be found in the documentation for your specific region.
    • Example us-east-1 Account ID: 123456789012 (Replace with actual ID from Genesys docs).
  4. Attach a policy that allows kms:Decrypt, kms:Encrypt, and kms:GenerateDataKey.

The Trap: Ensure the External ID is configured if using cross-account roles. Genesys Cloud may require an External ID to prevent the Confused Deputy Problem. If the External ID is missing or incorrect, the AssumeRole call will fail with AccessDenied. Contact Genesys Cloud Support to obtain the correct External ID for your Organization ID.

3. Registering the CMK in Genesys Cloud

Once the AWS KMS key is created and the policy is configured, you must register the key with Genesys Cloud. This step links the AWS CMK to your Genesys Cloud Organization’s recording infrastructure.

Step 3.1: Navigate to Recording Settings

In the Genesys Cloud Admin portal:

  1. Go to Admin > Admin > Settings.
  2. Select Recording from the left-hand menu.
  3. Locate the Encryption section.

Step 3.2: Add the Customer-Managed Key

Click Add Encryption Key. You will be presented with a form to input the AWS KMS details.

  • Key Name: Enter a descriptive name (e.g., Production-Recording-CMK).
  • AWS KMS Key ARN: Copy the full ARN from the AWS KMS console. It will look like arn:aws:kms:us-east-1:123456789012:key/abcd1234-a123-4567-8901-abcdef123456.
  • Region: Confirm the AWS region matches your Genesys Cloud deployment region.

Click Save.

The Trap: Genesys Cloud validates the key immediately upon saving. If you receive a Validation Failed error, it is almost always due to one of two issues:

  1. The KMS Key Policy does not grant the Genesys Cloud principal the kms:DescribeKey permission. Genesys Cloud needs this to verify the key exists and is active.
  2. The key is in a different region than the Genesys Cloud tenant. Cross-region KMS calls are not supported for recording encryption due to latency and compliance boundaries.

Step 3.3: Assigning the Key to Recording Types

Not all recordings need BYOK encryption. Screen recordings, for example, may contain less sensitive data than voice recordings containing PII. You can assign the CMK to specific recording types.

  1. Go to Admin > Admin > Settings > Recording > Recording Types.
  2. Edit the Voice recording type.
  3. In the Encryption tab, select the newly created Production-Recording-CMK.
  4. Repeat for Screen or Chat if required by policy.

Architectural Reasoning: Segregating encryption keys by recording type allows for granular key rotation. If a breach is suspected in screen recording infrastructure, you can rotate the screen recording CMK without disrupting voice recording availability. This minimizes operational blast radius.

4. Configuring Recording Retention and Deletion

BYOK introduces a critical dependency: if the CMK is deleted or disabled, the recordings encrypted with that key become permanently inaccessible. This is a feature, not a bug, as it ensures data confidentiality. However, it requires careful management of retention policies.

Step 4.1: Setting Retention Policies

Go to Admin > Admin > Settings > Recording > Retention.

  1. Create a retention policy for Voice recordings.
  2. Set the Retention Period to comply with your regulatory requirements (e.g., 7 years for HIPAA).
  3. Enable Delete after retention period.

The Trap: Do not set retention periods that exceed the lifecycle of your AWS account or the intended lifecycle of the CMK. If you plan to migrate away from Genesys Cloud or AWS, you must export recordings before deleting the CMK. Once the CMK is scheduled for deletion (even in the 7-day waiting period), decryption capabilities are revoked.

Step 4.2: Handling Key Deletion

If you need to decommission a CMK:

  1. Ensure all recordings encrypted with that key have been exported or are no longer required.
  2. In Genesys Cloud, remove the CMK from all Recording Types.
  3. Wait for all active recording sessions using that key to complete and be archived.
  4. In AWS KMS, schedule the key for deletion.

Architectural Reasoning: Genesys Cloud does not automatically re-encrypt existing recordings when you switch CMKs. Existing recordings remain encrypted with the old key. New recordings use the new key. This is crucial for audit trails. If you need to migrate all data to a new key, you must export, decrypt, and re-import, which is a complex operation not supported natively in the UI. Plan for key longevity.

Validation, Edge Cases & Troubleshooting

Edge Case 1: Decryption Failures During Playback

The Failure Condition: Agents or supervisors attempt to play back a recorded call in the Genesys Cloud UI, but the playback fails with an error: Failed to decrypt recording. Please contact your administrator.

The Root Cause:

  1. The KMS Key Policy was modified after registration, revoking Genesys Cloud’s access.
  2. The CMK was disabled in AWS KMS.
  3. The Genesys Cloud tenant was moved to a different region (rare, but possible in migrations) and the key remains in the old region.

The Solution:

  1. Verify the CMK status in AWS KMS. Ensure it is Enabled.
  2. Review the KMS Key Policy. Ensure the Genesys Cloud principal still has kms:Decrypt and kms:DescribeKey permissions.
  3. Check CloudTrail logs in AWS for Decrypt API calls from the Genesys Cloud principal. Look for AccessDenied errors and review the specific reason (e.g., Key policy does not allow access).
  4. If the key was disabled, re-enable it. If the policy was changed, restore the permissions. Genesys Cloud will automatically retry decryption on the next playback attempt.

Edge Case 2: Key Rotation Impact on Historical Recordings

The Failure Condition: After rotating the CMK in AWS (creating a new key version), users report that some older recordings fail to play, while newer ones work correctly.

The Root Cause:
AWS KMS handles key rotation transparently for encryption, but decryption requires access to the specific key version used to encrypt the data key. If the key rotation process in AWS was interrupted or if the key policy for the previous key version was accidentally revoked, decryption fails. Note: AWS KMS retains previous key versions for decryption unless explicitly scheduled for deletion.

The Solution:

  1. Confirm that the CMK has not been scheduled for deletion.
  2. Verify that the KMS Key Policy applies to the key itself, not just specific versions. KMS policies are applied to the key ARN, which covers all versions.
  3. If the issue persists, check if the recording metadata points to a key version that no longer exists (extremely rare in AWS KMS).
  4. Ensure that the Genesys Cloud recording service has not cached an invalid token. Restarting the recording service in Genesys Cloud (requires Support ticket) may clear stale decryption contexts.

Edge Case 3: Cross-Region Recording Migration

The Failure Condition: An organization migrates from us-east-1 to eu-west-1. Existing recordings encrypted with the us-east-1 CMK become inaccessible in the new region.

The Root Cause:
KMS keys are region-specific. A CMK in us-east-1 cannot be used to decrypt data in eu-west-1. Genesys Cloud does not support cross-region KMS decryption for recordings.

The Solution:

  1. Before migration, export all critical recordings from the us-east-1 tenant using the Recording API.
  2. Decrypt the recordings locally using the us-east-1 CMK (requires the key material or access to the AWS account).
  3. Re-encrypt the recordings using a new CMK in eu-west-1.
  4. Import the re-encrypted recordings into the new eu-west-1 tenant.
  5. This process requires significant engineering effort and should be planned well in advance. It is recommended to maintain the original region for archival purposes if decryption capability must be preserved.

Official References