What is email encryption and how does Office 365 use it?
Encryption is the process by which information is encoded so that only an authorized recipient can decode and consume the information. Office 365 uses encryption in two ways: in the service, and as a customer control. In the service, encryption is used in Office 365 by default; you don’t have to configure anything. For example, Office 365 uses Transport Layer Security (TLS) to encrypt the connection, or session, between two servers.
Here’s how email encryption typically works:
For more information on how Office 365 secures communication between servers, such as between organizations within Office 365 or between Office 365 and a trusted business partner outside of Office 365, see How Exchange Online uses TLS to secure email connections in Office 365.
Watch this video for an introduction to Encryption in Office 365.
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