OBFUSCATION ASSISTING APARATUS

• US 20100180346A1
• Filed: 01/17/2008
• Published: 07/15/2010
• Est. Priority Date: 01/18/2007
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Asai, Rieko, Matsushima, Hideki, Nicolson, Kenneth Alexander, Sato, Taichi
• Granted Patent: US 9,589,115 B2
• Time in Patent Office: Days
• US Class Current: 726/26
• CPC Class Codes: G06F 21/14 against software analysis or reverse engineering, e.g. by obfuscation

Abstract

To provide, in order that proper obfuscation of a source code (100) can be easily performed, an obfuscation assisting apparatus (11) which can sufficiently assist the obfuscation. The obfuscation assisting apparatus (11) includes: an analyzer (114) which identifies corresponding respective blocks in the source code (100) and in a transformed code (104) generated through the obfuscation of the source code (100); and a browser (119) which obtains obfuscation information relating to obfuscation of the respective blocks of the source code (100) and the transformed code (104), and causes an output device (1002) to display the respective parts of the source code (100) and the transformed code (104), and the obfuscation information in association with each other.

Claims

1. (canceled)

2. (canceled)

3. An obfuscation assisting apparatus which assists obfuscation of a program, said obfuscation assisting apparatus comprising:

an analyzing unit operable to identify a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining unit is operable to obtain obfuscation parameters used for obfuscating the focusing part of the source code;

a display control unit operable to cause a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified by said analyzing unit, and the obfuscation parameters obtained by said obtaining unit;

an input unit operable to receive an operation by a user; and

an obfuscation control unit operable, in response to the operation received by said input unit, to tune the obfuscation parameters displayed on the display unit, and to update the focusing part of the obfuscated code by causing a computer to obfuscate the focusing part of the source code according to the tuned obfuscation parameters.

4. The obfuscation assisting apparatus according to claim 3,

wherein said obtaining unit is further operable to obtain the tuned obfuscation parameters, and

said display control unit is further operable to cause the display unit to display, in association with each other, the focusing part of the source code, the updated focusing part of the obfuscated code, and the tuned obfuscation parameters.

5. (canceled)

6. (canceled)

7. (canceled)

8. An obfuscation assisting apparatus which assists obfuscation of a program, said obfuscation assisting apparatus comprising:

an analyzing unit operable to identify a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining unit operable to obtain obfuscation information relating to obfuscation of the respective focusing parts of the source code and the obfuscated code;

a display control unit operable to cause a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified by said analyzing unit, and the obfuscation information obtained by said obtaining unit; and

a metric calculating unit operable to calculate a metric indicating a level or quality of difficulty of analyzing the focusing part of the obfuscated code,

wherein said obtaining unit is operable to obtain, as the obfuscation information, the metric calculated by said metric calculating unit.

9. The obfuscation assisting apparatus according to claim 8,

wherein said metric calculating unit is operable, when the focusing part of the obfuscated code identified by said analyzing unit is changed, to calculate a metric for the focusing part and to store the calculated metric in a recording medium, so as to create a history of the metric.

10. The obfuscation assisting apparatus according to claim 9,

wherein said display control unit is further operable to cause the display unit to display the history created by said metric calculating unit.

11. The obfuscation assisting apparatus according to claim 10, further comprising

an executing unit operable to execute an object code generated by compiling the obfuscated code,

wherein said analyzing unit is operable to alter the respective parts to be identified, by identifying, as the respective focusing parts of the source code and the obfuscated code, respective parts in the source code and in the obfuscated code that correspond to a part that is being executed by the executing unit in the object code.

12. The obfuscation assisting apparatus according to claim 11,

wherein said executing unit is operable to stop execution of the object code when a value of a metric calculated last by said metric calculating unit becomes smaller than a predetermined threshold, or to stop execution of the object code when the value of the metric becomes larger than the predetermined threshold.

13. The obfuscation assisting apparatus according to claim 9,

wherein said metric calculating unit is further operable to calculate a metric indicating a level or quality of difficulty of analyzing the focusing part of the source code, and

said display control unit is operable to cause the display unit to display the metric of the source code in association with the respective focusing parts of the source code and the obfuscated code.

14. The obfuscation assisting apparatus according to claim 9,

wherein said metric calculating unit is operable to calculate a number of actively used variables among variables in the focusing part of the obfuscated code, as the metric.

15. The obfuscation assisting apparatus according to claim 9,

wherein said metric calculating unit is operable to calculate a percentage of actively used variables among variables in the focusing part of the obfuscated code, as the metric.

16. The obfuscation assisting apparatus according to claim 9,

wherein said metric calculating unit is operable to calculate an average lifetime of actively used variables among variables in the focusing part of the obfuscated code, as the metric.

17. (canceled)

18. A method of assisting obfuscation of a program, said method comprising:

an identification step of identifying a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining step of obtaining obfuscation parameters used for obfuscating the focusing part of the source code;

a display control step of causing a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified in said identifying step, and the obfuscation parameters obtained in said obtaining step;

an input step of receiving an operation by a user; and

an obfuscation control step of, in response to the operation received in said input step, tuning the obfuscation parameters displayed on the display unit, and updating the focusing part of the obfuscated code by causing a computer to obfuscate the focusing part of the source code according to the tuned obfuscation parameters.

19. A program for assisting obfuscation of a program to be processed, said program causing a computer to execute:

an identification step of identifying a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program to be processed which is written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining step of obtaining obfuscation parameters used for obfuscating the focusing part of the source code;

a display control step of causing a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified in said identifying step, and the obfuscation parameters obtained in said obtaining step;

an input step of receiving an operation by a user; and

an obfuscation control step of, in response to the operation received in said input step, tuning the obfuscation parameters displayed on the display unit, and updating the focusing part of the obfuscated code by causing a computer to obfuscate the focusing part of the source code according to the tuned obfuscation parameters.

20. An integrated circuit which assists obfuscation of a program, said obfuscation assisting apparatus comprising:

an analyzing unit operable to identify a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining unit operable to obtain obfuscation parameters used for obfuscating the focusing part of the source code;

a display control unit operable to cause a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified by said analyzing unit, and the obfuscation parameters obtained by said obtaining unit;

an input step of receiving an operation by a user; and

an obfuscation control step of, in response to the operation received by said input unit, tuning the obfuscation parameters displayed on the display unit, and updating the focusing part of the obfuscated code by causing a computer to obfuscate the focusing part of the source code according to the tuned obfuscation parameters.

21. A method of assisting obfuscation of a program, said method comprising:

an identification step of identifying a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining step of obtaining obfuscation information relating to obfuscation of the respective focusing parts of the source code and the obfuscated code;

a display control step of causing a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified in said identifying step, and the obfuscation information obtained in said obtaining step; and

a metric calculating step of calculating a metric indicating a level or quality of difficulty of analyzing the focusing part of the obfuscated code,

wherein in said obtaining step, the metric calculated in said metric calculating step is obtained as the obfuscation information.

22. A program for assisting obfuscation of a program to be processed, said program causing a computer to execute:

an identification step of identifying a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program to be processed which is written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining step of obtaining obfuscation information relating to obfuscation of the respective focusing parts of the source code and the obfuscated code;

a display control step of causing a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified in said identifying step, and the obfuscation information obtained in said obtaining step; and

a metric calculating step of calculating a metric indicating a level or quality of difficulty of analyzing the focusing part of the obfuscated code,

wherein in said obtaining step, the metric calculated in said metric calculating step is obtained as the obfuscation information.

23. An integrated circuit which assists obfuscation of a program, said obfuscation assisting apparatus comprising:

an analyzing unit operable to identify a focusing part in a source code and a focusing part in an obfuscated code that correspond to each other, the source code being a program written in a high-level language, and the obfuscated code being written in the high-level language and generated by obfuscating the source code;

an obtaining unit operable to obtain obfuscation information relating to obfuscation of the respective focusing parts of the source code and the obfuscated code;

a display control unit operable to cause a display unit to display, in association with each other, the respective focusing parts of the source code and the obfuscated code identified by said analyzing unit, and the obfuscation information obtained by said obtaining unit; and

a metric calculating unit operable to calculate a metric indicating a level or quality of difficulty of analyzing the focusing part of the obfuscated code,

wherein said obtaining unit is operable to obtain, as the obfuscation information, the metric calculated by said metric calculating unit.