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Content in Office 365 Groups/SharePoint is automatically encrypted at rest and in transit.

Encryption at rest

When a file is saved in an Office 365 Group, the file is automatically encrypted while it is stored in the cloud. 

Encryption in transit

When someone downloads or reads/writes a file, the traffic on the network is also always automatically encrypted because the Office 365 service is using HTTPS/SSL/TLS as transport protocols (note that these are encrypted protocols). 

More information

  • For examples and more information on Encryption in Office 365, visit Microsoft's information on Encryption in Office 365
  • For more details about encryption spefically in SharePoint Online and OneDrive for Business, visit Microsoft's documention

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