You can use Slack Enterprise Key Management (EKM) to control and get visibility into how your organization’s data is accessed in Slack. It is available as a security add-on for the Enterprise Grid plan, and is included on the GovSlack plan.

What to expect

• Use your own encryption keys (stored in Amazon's Key Management Service) to encrypt messages and files.
• To minimize disruption for members of your organization, you can revoke granular access to encryption keys. 
• Org members can use Slack as normal, even if some data has restricted access.
• With data residency for Slack, new EKM customers can choose to create and store encryption keys in a specific data region.

How Slack EKM works

Data encrypted with customer-controlled keys

The following categories of customer data will be encrypted at rest with keys stored in the customer’s AWS account:

• Messages, canvases, and snippets
• Files (ex., images, docs, clips, etc.) uploaded to the Slack Service
• Search index of Customer Data
• Messages and files generated by apps or bots (except Slackbot)
• Sidebar custom sections
• Any data collected by an app deployed to Slack's managed infrastructure, as well as the app's datastores, developer secrets, and logs

Data encrypted with Slack-controlled keys

The following categories of data may be encrypted at rest with keys generated and stored by Slack:

• Slack member profiles, including custom statuses
• Channel names, topics, descriptions, and bookmarks
• File names
• Workspace and channel membership information
• Slackbot messages
• Data used to measure seat count, usage, and revenue
• Data used for analytics and to measure quality of service, ex. sanitized logs
• IDs generated by Slack on behalf of the customer
• Deal celebration data

Note: When you enroll in EKM, any existing data will be encrypted with customer-controlled keys.

Slack Connect

If external organizations are working together in Slack Connect, the shared contents are covered by EKM in the following ways:

• Each organization’s messages will be encrypted with their EKM keys, if applicable.
• The search index for Slack Connect channels with be duplicated and encrypted with each customer’s EKM keys.
• If an organization is removed from a Slack Connect channel, they'll retain an archived copy if they have permission to post, invite, and more.

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