PROTECTING CONTENT FROM THIRD PARTY USING CLIENT-SIDE SECURITY PROTECTION

• US 20150186675A1
• Filed: 01/29/2015
• Published: 07/02/2015
• Est. Priority Date: 01/20/2009
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: Banti, Edward T., Byrum, Frank, Carvalho Neto, Mayerber L., Knibb, James R., Biswas, Palash, Barnes, Christopher
• Granted Patent: US 9,418,244 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 21/6263 during internet communication, e.g. revealing personal data from cookies
• CPC Class Codes: H04L 63/0263 Rule management
• CPC Class Codes: H04L 63/0435 wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption cryptographic mechanisms or cryptographic arrangements for symmetric key encryption H04L9/06
• CPC Class Codes: H04L 63/06 for supporting key management in a packet data network cryptographic mechanisms or cryptographic arrangements for key management H04L9/08
• CPC Class Codes: H04L 63/20 for managing network security; network security policies in general filtering policies H04L63/0227

Abstract

Architecture that employs encryption and storage of encryption keys to protect trusted client message content from an untrusted third-party hosted service. Each trusted user machine is configured to optionally apply security to messages. Rules determine when automatic protection is applied and the level of protection to apply. The trusted client automatically downloads the rules (or rules policies) from a trusted rules service and caches the rules locally. During composition, the rules analyze the message and automatically apply security template(s) to the message. The security template(s) encrypt the body of the message, but not the headers or subject. The untrusted message service processes the header and delivers the message to the correct recipient. The hosted service cannot view the contents of the message body, and only intended recipients of the protected message can view the message body. Offline protection is supported, and the user can override protection by the rules.

Claims

1-20. -20. (canceled)

21. A computer-implemented messaging system, comprising:

an untrusted message service for sending one or more messages from a client to one or more recipients;

wherein the untrusted message service provides rules to the client;

wherein the rules provide for security, the security allowing exposure of a header portion and a subject portion of the message at the untrusted message service; and

wherein the security further prevents a body portion and message attachments of the message from being exposed at the untrusted message service.

28. A computer-implemented method of processing messages, comprising:

receiving a message from a client to a recipient;

analyzing the message using rules from a trusted rules service associated with an untrusted message service, wherein the rules provide for security that allows exposure of a header portion and a subject portion of the message at the untrusted message service and prevents a body portion and message attachments of the message from being exposed at the untrusted message service; and

sending the message to the recipient using the untrusted message service.

35. A computer-implemented method of processing messages, comprising:

using an untrusted message service, sending one or more messages from a client to one or more recipients;

wherein the untrusted message service provides rules to the client;

wherein the rules provide for security, the security allowing exposure of a header portion and a subject portion of the message at the untrusted message service; and

wherein the security further prevents a body portion and message attachments of the message from being exposed at the untrusted message service.