What is Google Workspace Client-Side Encryption?
Google Workspace offers robust security and encryption at rest and in transit for all users. However, for organisations dealing with highly sensitive data, strict compliance regulations, or government contracts, standard encryption is sometimes insufficient because Google holds the decryption keys. Client-Side Encryption (CSE) solves this problem by allowing your organisation to encrypt data using your own cryptographic keys before it is uploaded to Google’s servers.
When CSE is enabled, Google cannot decrypt your data under any circumstances. If the data is intercepted or if Google’s servers are compromised, the files remain entirely unreadable without access to your external key management service.
Why You Should Use Client-Side Encryption
Client-side encryption is primarily designed for enterprise environments. It provides complete data sovereignty. You should implement this if your organisation needs to:
- Comply with strict regulatory frameworks like ITAR, CJIS, or specific European data privacy laws.
- Protect intellectual property (IP) from any potential exposure.
- Ensure that cloud providers have zero technical ability to access corporate documents.
CSE currently supports Google Drive, Google Docs, Sheets, Slides, and Google Meet.
How to Set Up Client-Side Encryption
Setting up CSE is an administrative task that requires a Google Workspace Enterprise Plus, Education Plus, or Education Standard edition. You cannot enable this on a standard personal Google Account.
Step 1: Choose a Key Access Service (KAS)
Because Google will not hold the keys, you must set up an external Key Access Service. You can build your own using Google’s open-source API specifications, or you can partner with an established third-party identity and key management provider such as:
- Thales
- Fortanix
- Virtru
- Stormshield
Step 2: Connect the KAS to Google Workspace
Once your key management service is running, you must connect it to your Google Workspace environment.
- Sign in to the Google Admin Console (admin.google.com) with super administrator privileges.
- Navigate to Security > Access and data control > Client-side encryption.
- Under External key service, click Add Key Service.
- Enter the URL provided by your KAS partner and follow the authentication prompts to establish the connection.
Step 3: Assign Users and Enable CSE
You do not need to force CSE on your entire organisation. It is usually best to apply it only to specific organisational units (OUs) or groups that handle sensitive data.
- In the Admin Console, go back to the Client-side encryption page.
- Select the specific Google Workspace app (e.g., Google Drive and Docs).
- Select the Organisational Unit you want to manage from the left panel.
- Change the policy to ON.
How to Create an Encrypted Document
Once the administrator has configured the backend, end-users can easily create encrypted files.
- Open Google Drive in your web browser.
- Click the + New button.
- Hover over the arrow next to Google Docs, Sheets, or Slides.
- Select Blank encrypted document.
- A new document will open. You will notice a prominent shield icon at the top of the screen indicating that Client-Side Encryption is active.
Limitations of Client-Side Encryption
Because Google cannot read the data within a client-side encrypted document, several standard Google Workspace features will not function:
- No co-authoring: Multiple users cannot edit an encrypted document simultaneously in real-time.
- Limited search: You cannot search for text inside an encrypted document using Google Drive search, as Google cannot index the contents.
- No grammar suggestions: Advanced AI-driven features like Smart Compose and Grammar Check will not work.
Next Steps
Client-side encryption introduces friction into the daily workflow due to the loss of real-time collaboration features. Therefore, administrators should carefully audit which teams genuinely require this level of cryptographic isolation before deploying it organisation-wide.