Security system for electronic equipment

• US 10,581,906 B2
• Filed: 03/06/2017
• Issued: 03/03/2020
• Est. Priority Date: 09/28/2016
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Cho, Kyong-Tak, Zhao, Li, Sastry, Manoj R.
• Primary Examiner(s): Tsai, Henry
• Assistant Examiner(s): Hassan, Aurangzeb
• Application Number:
  US15/450,650
• Publication Number:
  US 20180091550A1
• Time in Patent Office: 1,093 Days
• Field of Search: None
• CPC Class Codes: B60R 16/0232 for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
• CPC Class Codes: B60R 25/20 Means to switch the anti-theft system on or off
• CPC Class Codes: G01R 19/04 Measuring peak values or amplitude or envelope of ac or of pulses
• CPC Class Codes: G01R 19/16533 characterised by the application
• CPC Class Codes: H04L 12/40026 Details regarding a bus guardian
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 63/1466 Active attacks involving interception, injection, modification, spoofing of data unit addresses, e.g. hijacking, packet injection or TCP sequence number attacks

Abstract

One embodiment provides an electronic control unit (ECU) for a vehicle. The ECU includes transceiver circuitry, voltage measurement circuitry and feature set circuitry. The transceiver circuitry is to at least one of send and/or receive a message. The voltage measurement circuitry is to determine at least one of a high bus line voltage (VCANH) value and/or a low bus line voltage (VCANL) value, for each zero bit of at least one zero bit of a received message. The received the message includes a plurality of bits. The feature set circuitry is to determine a value of at least one feature of a feature set based, at least in part, on at least one of a high acknowledge (ACK) threshold voltage (VthH) and/or a low ACK threshold voltage (VthL). The feature set includes at least one of an operating most frequently measured VCANH value (VfreqH2) of a number of VCANH values and/or an operating most frequently measured VCANL value (VfreqL2) of a number of VCANL values.

Claims

1. An electronic control unit (ECU) for a vehicle, the ECU comprising:

transceiver circuitry to at least one of send and/or receive a message;

voltage measurement circuitry to determine a high bus line voltage (VCANH) value and/or a low bus line voltage (VCANL) value for each zero bit of a received message;

acknowledge (ACK) circuitry to determine, based on a plurality of VCANH and/or VCANL values corresponding to a plurality of received messages, an initial most frequently measured VCANH value (VfreqH1) and/or an initial most frequently measured VCANL value (VfreqL1), the ACK circuitry to further determine a high ACK threshold voltage (VthH) and/or a low ACK threshold voltage (VthL) based on the VfreqH1 and/or the VfreqL1; and

feature set circuitry to determine a value of at least one feature of a feature set, the feature set comprising at least one of an operating most frequently measured VCANH value (VfreqH2) of a number of VCANH values and/or an operating most frequently measured VCANL value (VfreqL2) of a number of VCANL values;

wherein the VfreqH2 is determined based on VCANH values less than VthH; and

wherein the VfreqL2 is determined based on VCANL values greater than VthL.

2. The ECU of claim 1, further comprising classifier circuitry to identify a transmitting ECU that transmitted the received message based, at least in part, on the set of feature values.

3. The ECU of claim 2, further comprising signature circuitry to determine whether or not the received message was legitimately transmitted by the identified transmitting ECU.

4. The ECU of claim 1, wherein the feature set comprises VthH and/or VthL, and VthH corresponds to an initial value of the high ACK threshold voltage or an adjusted value of the high ACK threshold voltage and VthL corresponds to an initial value of the low ACK threshold voltage or an adjusted value of the low ACK threshold voltage.

5. The ECU of claim 1, wherein the feature set circuitry is further to determine at least one of a first probability (PoutH) that a recently captured VCANH value is greater than VthH and/or a second probability (PoutL) that a recently captured VCANL value is less than VthL.

6. The ECU of claim 1, wherein the feature set further comprises a moving average of VfreqH2 and a moving average of VthH and/or a moving average of VfreqL2 and a moving average of VthL.

7. A method comprising:

at least one of sending and/or receiving, by transceiver circuitry of an electronic control unit (ECU) for a vehicle, a message;

determining, by voltage measurement circuitry of the ECU, at least one of a high bus line voltage (VCANH) value and/or a low bus line voltage (VCANL) value for each zero bit of a received message;

determining, by acknowledge (ACK) circuitry, an initial most frequently measured VCANH value (VfreqH1) and/or an initial most frequently measured VCANL value (VfreqL1) based on a plurality of VCANH and/or VCANL values corresponding to a plurality of received messages;

determining, by acknowledge (ACK) circuitry, a high ACK threshold voltage (VthH) and/or a low ACK threshold voltage (VthL) based on the VfreqH1 and/or the VfreqL1; and

determining, by feature set circuitry of the ECU, a value of at least one feature of a feature, the feature set comprising at least one of an operating most frequently measured VCANH value (VfreqH2) of a number of VCANH values and/or an operating most frequently measured VCANL value (VfreqL2) of a number of VCANL values;

wherein the VfreqH2 is determined based on VCANH values less than VthH; and

wherein the VfreqL2 is determined based on VCANL values greater than VthL.

8. The method of claim 7, further comprising identifying, by classifier circuitry of the ECU, a transmitting ECU that transmitted the received message based, at least in part, on the set of feature values.

9. The method of claim 8, further comprising determining, by signature circuitry of the ECU, whether or not the received message was legitimately transmitted by the identified transmitting ECU.

10. The method of claim 7, wherein the feature set comprises VthH and/or VthL, and VthH corresponds to an initial value of the high ACK threshold voltage or an adjusted value of the high ACK threshold voltage and VthL corresponds to an initial value of the low ACK threshold voltage or an adjusted value of the low ACK threshold voltage.

11. The method of claim 7, further comprising determining, by the feature set circuitry, at least one of a first probability (PoutH) that a recently captured VCANH value is greater than VthH and/or a second probability (PoutL) that a recently captured VCANL value is less than VthL.

12. The method of claim 7, wherein the feature set further comprises a moving average of VfreqH2 and a moving average of VthH and/or a moving average of VfreqL2 and a moving average of VthL.

13. A vehicle system comprising:

a plurality of electronic control units (ECUs); and

a communication bus to couple the plurality of ECUs,

each ECU comprising transceiver circuitry to at least one of send and/or receive a message, and

at least one ECU comprising;

voltage measurement circuitry to determine a high bus line voltage (VCANH) value and/or a low bus line voltage (VCANL) value for each zero bit of a received message;

acknowledge (ACK) circuitry to determine, based on a plurality of VCANH and/or VCANL values corresponding to a plurality of received messages, an initial most frequently measured VCANH value (VfreqH1) and/or an initial most frequently measured VCANL value (VfreqL1), the ACK circuitry to further determine a high ACK threshold voltage (VthH) and/or a low ACK threshold voltage (VthL) based on the VfreqH1 and/or the VfreqL1; and

feature set circuitry to determine a value of at least one feature of a feature set, the feature set comprising at least one of an operating most frequently measured VCANH value (VfreqH2) of a number of VCANH values and/or an operating most frequently measured VCANL value (VfreqL2) of a number of VCANL values;

wherein the VfreqH2 is determined based on VCANH values less than VthH; and

wherein the VfreqL2 is determined based on VCANL values greater than VthL.

14. The vehicle system of claim 13, wherein the at least one ECU further comprises classifier circuitry to identify a transmitting ECU that transmitted the received message based, at least in part, on the set of feature values.

15. The vehicle system of claim 14, wherein the at least one ECU further comprises signature circuitry to determine whether or not the received message was legitimately transmitted by the identified transmitting ECU.

16. The vehicle system of claim 13, wherein the feature set comprises VthH and/or VthL, and VthH corresponds to an initial value of the high ACK threshold voltage or an adjusted value of the high ACK threshold voltage and VthL corresponds to an initial value of the low ACK threshold voltage or an adjusted value of the low ACK threshold voltage.

17. The vehicle system of claim 13, wherein the feature set circuitry is further to determine at least one of a first probability (PoutH) that a recently captured VCANH value is greater than VthH and/or a second probability (PoutL) that a recently captured VCANL value is less than VthL.

18. The vehicle system of claim 13, wherein the feature set further comprises a moving average of VfreqH2 and a moving average of VthH and/or a moving average of VfreqL2 and a moving average of VthL.

19. The vehicle system of claim 13, wherein the communication bus complies and/or is compatible with a controller area network (CAN) bus protocol.