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Microsoft Bringing E-Mail Encryption to Office 365 in 2014

Office 365 Message Encryption will roll out to Office 365 subscribers in the first quarter of 2014, Microsoft announced on Thursday.

The service, which is designed to encrypt e-mails being sent to outside sources, will be available for free for Office 365 E3 and E4 users, and will be included in the Windows Azure Rights Management service.

Office 365 Message Encryption can be seen as Microsoft's reaction to the raft of privacy concerns raised by this year's revelations of NSA spying. The service will provide "sensitive business communications with an additional level of protection against unauthorized access," and is ideal for protecting financial and private data, according to Microsoft.

While Microsoft is treating Office 365 Message Encryption as a new service, it does build on the company's previous message-encryption technology.

"Office 365 Message Encryption is the new version of Exchange Hosted Encryption (EHE)," said Microsoft in a blog post announcing the service. "This version includes all of the capabilities of EHE plus new features, such as the ability to apply your company's branding to encrypted messages. Like EHE, Office 365 Message Encryption works with Office 365 mailboxes as well as with on-premises mailboxes that use Exchange Online Protection."

Once administrators activate the new service and set transport rules either through a Web-based portal or PowerShell, any message meeting those rules will be automatically encrypted before leaving its point of origin. The recipient then receives the encrypted message as an e-mailed attachment and must sign in with the proper Office 365 ID or Microsoft account credentials before the message can be read.

Also, if the recipient responds to the protected e-mail, the reply is automatically encrypted.

Microsoft said its Office 365 Message Encryption service will use multiple encryption and security features, including:

  • Transport Layer Security (TLS), which protects the message in the mail server

  • Secure Socket Layer (SSL), which encrypts the message as it travels from the mail server to Office 365 servers

  • Bitlocker, used to encrypt the data on the datacenter hard drives

  • Information Rights Management, which blocks an encrypted message from being forwarded, copied or printed without authorization

  • Secure/Multipurpose Internet Mail Extensions (S/MIME), which will allow users to include client-side encryption keys

Microsoft is not the only online services company looking to step up its encryption capabilities in the wake of the NSA surveillance accusations. Yahoo last week also announced that all user data traveling through its datacenters will be encrypted sometime in 2014, and its e-mail service will start employing the Secure Sockets Layer (SSL) encryption standard with a 2048-bit key on Jan. 8, 2014.

About the Author

Chris Paoli (@ChrisPaoli5) is the associate editor for Converge360.

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