Data leak protection

• US 9,497,192 B2
• Filed: 12/16/2015
• Issued: 11/15/2016
• Est. Priority Date: 06/28/2012
• Status: Active Grant

• Current Assignee: Fortinet Inc.
• Original Assignee: Fortinet Inc.
• Inventors: Nelson, Michael D., Xie, Michael
• Primary Examiner(s): BROWN, ANTHONY D
• Application Number:
  US14/971,340
• Publication Number:
  US 20160099942A1
• Time in Patent Office: 335 Days
• Field of Search: 726/26
• US Class Current: 1/1
• CPC Class Codes: G06F 16/9535 Search customisation based on user profiles and personalisation
• CPC Class Codes: G06F 21/16 Program or content traceability, e.g. by watermarking
• CPC Class Codes: H04L 2209/608 Watermarking
• CPC Class Codes: H04L 63/0236 Filtering by address, protocol, port number or service, e.g. IP-address or URL
• CPC Class Codes: H04L 63/0245 Filtering by information in the payload
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/0876 based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
• CPC Class Codes: H04L 63/105 Multiple levels of security
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 63/123 received data contents, e.g. message integrity
• CPC Class Codes: H04L 9/0643 Hash functions, e.g. MD5, SHA, HMAC or f9 MAC

Abstract

Methods and systems for Data Leak Prevention (DLP) in an enterprise network are provided. According to one embodiment, a data leak protection method is provided. Information regarding a watermark filtering rule is received by a network security device. The information includes a sensitivity level and an action to be applied to files observed by the network security device that match the watermark filtering rule. A file attempted to be passed through the network security device is received by the network security device. A watermark embedded within the received file is detected by the network security device. A sensitivity level associated with the watermark is compared by the network security device to the sensitivity level of the watermark. When the comparison results in a match, then the action specified by the watermark filtering rule is performed by the network security device.

Claims

1. A data leak protection method comprising:

receiving, by a network security device protecting an enterprise network, information regarding a watermark filtering rule, including a sensitivity level and an action to be applied to files observed by the network security device satisfying the watermark filtering rule;

receiving, by the network security device, network traffic originating within the enterprise network, directed to a destination device residing outside of the enterprise network and containing a file attempted to be passed through the network security device;

extracting, by the network security device, a watermark embedded within the received file;

comparing, by the network security device, a sensitivity level associated with the watermark to the sensitivity level of the watermark filtering rule; and

when the comparing results in a match, then performing, by the network security device, the action specified by the watermark filtering rule.

2. The method of claim 1, further comprising, prior to said detecting, embedding, by a separate client program, the watermark into the file responsive to the file being identified as a file to be protected.

3. The method of claim 2, further comprising receiving, by the separate client program, watermark content, including information regarding a sensitivity level of the file.

4. The method of claim 3, further comprising identifying, by the separate client program, a file type of the file;

and wherein said embedding the watermark into the file is based upon the file type.

5. The method of claim 3, further comprising generating, by the separate client program, the watermark based on the watermark content.

6. The method of claim 5, wherein the watermark includes a hash value or a message digest of the watermark content.

7. The method of claim 1, wherein the sensitivity level is selected from a group comprising critical sensitivity, high sensitivity, medium sensitivity and low sensitivity.

8. The method of claim 1, wherein the action specified by the watermark filtering rule comprises blocking the file at the network device or passing the file through the network security device.

9. The method of claim 1, wherein the file is attached to an electronic mail (email) message or is being transferred via a file transfer protocol from a source device to the destination device.

10. The method of claim 9, wherein the action specified by the watermark filtering rule comprises logging information regarding one or more of a user associated with the source device, an Internet Protocol (IP) address associated with the source device, a time, a date and an interface of the network security device on which the file was received.

11. A non-transitory program storage device readable by a network security device protecting an enterprise network, embodying a program of instructions executable by one or more computer processors of the network security device to perform a method of data leak protection, the method comprising:

receiving information regarding a watermark filtering rule, including a sensitivity level and an action to be applied to files observed by the network security device satisfying the watermark filtering rule;

receiving network traffic originating within the enterprise network, directed to a destination device residing outside of the enterprise network and containing a file attempted to be passed through the network security device;

extracting a watermark embedded within the received file;

comparing a sensitivity level associated with the watermark to the sensitivity level of the watermark filtering rule; and

when the comparing results in a match, then performing the action specified by the watermark filtering rule.

12. The non-transitory program storage device of claim 11, wherein the watermark has been embedded into the file by a separate client program running on a watermarking console responsive to the file being identified as a file to be protected.

13. The non-transitory program storage device of claim 12, wherein the separate client program receives watermark content, including information regarding a sensitivity level of the file, from a network administrator.

14. The non-transitory program storage device of claim 13, wherein the separate client program identifies a file type of the file and embeds the watermark into the file is based upon the file type.

15. The non-transitory program storage device of claim 13, wherein the watermark is generated by the separate client program based on the received watermark content.

16. The non-transitory program storage device of claim 15, wherein the watermark includes a hash value or a message digest of the watermark content.

17. The non-transitory program storage device of claim 11, wherein the sensitivity level is selected from a group comprising critical sensitivity, high sensitivity, medium sensitivity and low sensitivity.

18. The non-transitory program storage device of claim 11, wherein the action specified by the watermark filtering rule comprises blocking the file at the network security device or allowing the file to pass through the network security device.

19. The non-transitory program storage device of claim 11, wherein the file is attached to an electronic mail (email) message or is being transferred via a file transfer protocol from a source device to the destination device.

20. The non-transitory program storage device of claim 19, wherein the action specified by the watermark filtering rule comprises logging information regarding one or more of (i) a user associated with the source device, (ii) an Internet Protocol (IP) address associated with the source device, (iii) a time, (iv) a date and (v) an interface of the network security device on which the file was received.