Patent Publication Number: US-9423425-B2

Title: Side-channel analysis apparatus and method based on profile

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     The present invention claims priority of Korean Patent Application No. 10-2012-0058684, filed on May 31, 2012, which is incorporated herein by reference. 
     FIELD OF THE INVENTION 
     The present invention relates to a side channel analysis; and more particularly to a side channel analysis apparatus and method based on a profile, which are capable of making all processes of the side channel analysis of collecting a waveform, preprocessing, and analyzing and the like easily understood through referring to the profile. 
     BACKGROUND OF THE INVENTION 
     Typically, side channel analysis is a technology finding a key of a cryptographic module by collecting, preprocessing, analyzing waveforms of power, electromagnetic waves and the like generated when the cryptographic module of an apparatus to be analyzed is operated through a waveform collection device such as an oscilloscope. 
     Further, a current side channel analysis system mainly performs the side channel analysis by the waveform. In process of collecting, preprocessing, and analyzing the waveform, whenever each process progresses, each process exports results thereof in a waveform. However, if only a result waveform of each process is provided, what relationship exists between the result waveforms, whether the result waveform is generated in any order, and what parameters have been used in each process may not be clearly known. 
     For example, the waveform is collected and stored through a waveform collection device, but it is difficult to know, by viewing the stored waveform, what waveform collection device is used, what sampling speed is applied, and what protocol is used to store the waveform and the like. Further, when the waveform is preprocessed several times, it is difficult to know, by only viewing the stored several waveforms, what waveform is preprocessed through which preprocessing and what parameter values are used in the preprocessing. Therefore, it is difficult to instruct know-how of analysis. 
     SUMMARY OF THE INVENTION 
     In view of the above, the present invention provides side channel analysis apparatus and method based on a profile, which are capable of making all processes of a side channel analysis of collecting a waveform, preprocessing, and analyzing and the like easily understood through referring to the profile by making each process of the side channel analysis through collecting waveform, preprocessing, and analyzing into a process in a side channel analysis system, making a profile for managing each process by connection of each process, thus enabling a parameter used in each process and each waveform of operation result of each process to be easily confirmed. 
     In accordance with a first aspect of the present invention, there is provided a side channel analysis apparatus based on a profile, including: a waveform collection unit configured to collect leaked information from a target device of a side channel analysis; a preprocessing unit configured to preprocess a waveform data correspond to the leaked information collected from the waveform collection unit before analyzing same; an analysis unit configured to analyze the waveform data preprocessed in the preprocessing unit; and a profile configuration unit configured to make each process of the waveform collection unit, the preprocessing unit, and the analysis unit into a process and make a profile for managing each process by connection of each process. 
     Further, the profile configuration unit may make a side channel analysis task about the target device of the side channel analysis into one project, make a plurality of profiles in a lower level of the project, and make a waveform collection process, preprocessing processes, and analysis processes in a lower level of each process to connect each other. 
     Further, the profile configuration unit may display parameters used in each process, and drives each process by the parameters. 
     Further, the process may receive a waveform of a previous process to generate a new waveform, and input the new generated waveform to a subsequent process. 
     In accordance with a second aspect of the present invention, there is provided a method for analyzing a side channel based on a profile. The method includes collecting a waveform by collecting leaked information from a target device of the side channel analysis; preprocessing a waveform data corresponding to the leaked information collected from the waveform collection unit before analyzing the waveform; analyzing the waveform data preprocessed in the preprocessing unit; and making each of said collecting a waveform, preprocessing a waveform data, and analyzing the waveform data into a process to make a profile. 
     Further, said making a profile may include making a side channel analysis task about the target device of the side channel analysis into one project about the side channel analysis target equipment; making a plurality of profiles in a lower level of the project; and making a waveform collection process, preprocessing processes, and analysis processes in a lower level of each profile to connect each other. 
     Further, said making a profile may be performed such that parameters used in each process are displayed, and each process is driven by the parameters. 
     Further, the process may receive the waveform of a previous process to generate a new waveform, and input the new generated waveform to a subsequent process. 
     In accordance with the present invention, it is possible to make all processes of a side channel analysis of collecting, preprocessing, analyzing a waveform and the like easily understood through referring to the profile by making each process of the side channel analysis into a process through collecting, preprocessing, and analyzing a waveform in a side channel analysis system, making a profile for managing each process by connection of each process, thus enabling a parameter used in each process and each waveform of operation result of each process to be easily confirmed. 
     Further, if an analysis method for the side channel analysis of one apparatus to be analyzed is instructed to a side channel certification authority by making a profile, each side channel certification authority may easily understand the method for the side channel analysis of the device through the profile. At this time, if the profile is initialized, the result waveform of each process is reset. Thereafter, if the profile is driven by connecting the waveform collection device with the device to be analyzed, the same result as that of the instructed certification authority may be obtained. Therefore, know-how of the analysis may be easily instructed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The objects and features of the present invention will become apparent from the following description of embodiments given in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a detailed block diagram showing a side channel analysis apparatus based on a profile in accordance with an embodiment of the present invention; 
         FIG. 2  is an exemplary diagram showing the configuration of a profile in accordance with the embodiment of the present invention; 
         FIG. 3  is an exemplary diagram showing a profile list and a parameter in accordance with the embodiment of the present invention; 
         FIG. 4  is an exemplary diagram showing composition of process and commands in accordance with the embodiment of the present invention; and 
         FIG. 5  is a diagram showing a structure of a profile in accordance with the embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings which form a part hereof. 
     In the following description of the present invention, if the detailed description of the already known structure and operation may confuse the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are terminologies defined by considering functions in the embodiments of the present invention and may be changed operators intend for the invention and practice. Hence, the terms need to be defined throughout the description of the present invention. 
       FIG. 1  is a detailed block diagram showing a side channel analysis apparatus  100  based on a profile, and may include a waveform collection unit  110 , a preprocessing unit  120 , an analysis unit  130 , and a profile configuration unit  140  in accordance with an embodiment of the present invention. 
     Hereinafter, the operation in each unit of the side channel analysis apparatus  100  of the present invention will be described in detail with reference to  FIG. 1 . 
     First, the waveform collection unit  110  may include an external measuring device for collecting leaked information (e.g., power consumption, electromagnetic wave and the like) leaked from electronic security equipment which is target of side channel analysis and an oscilloscope connected thereto. In other words, the waveform collection unit  110  may be configured to measure the leaked information using the external measuring device and to collect waveform data through the oscilloscope. 
     The preprocessing unit  120  may receive at least part of waveform data collected by the waveform collection unit  110  to preprocess the received waveform data for easy analysis. The analysis unit  130  may generate a result of the side channel analysis on the waveform data to be analyzed which is preprocessed by the preprocessing unit  120 . 
     At this time, the waveform collection unit  110 , the preprocessing unit  120 , and the analysis unit  130  may have a configuration of being operated independently and in parallel. In other words, each unit of the side channel analysis apparatus  100  shown in  FIG. 1  in accordance with the present invention may be implemented by a computer program including multi-processor multi-thread capable of performing functions described above in parallel and a computer device capable of driving the computer program. 
     The profile configuration unit  140  may make each process of collecting waveform, preprocessing, and analyzing, which is performed in each of the waveform collection unit  110 , the preprocessing unit  120 , the analysis unit  130  and the like into a process, and may make a profile for managing each process by connection of each process. Specifically, the profile configuration unit  140  makes a side channel analysis task about the target device of the side channel analysis into one project, makes a plurality of profiles in a lower level of the project, and makes a waveform collection process, preprocessing processes, and analysis processes in a lower level of each process to connect each other. At this time, each process may have each parameter, and each process may be driven by setting these parameters. Each process receives and processes a waveform of previous process to generate a different waveform, and transmits the generated waveform to subsequent process. 
     Therefore, the flow of the processes from collecting to analyzing the waveform may clearly be seen, and the parameters of each process may be easily understood. Further, the waveform which is the result of operation of each process may be easily seen. Therefore, anyone may clearly understand a method for collecting, preprocessing and analyzing of the waveform if only to see the profile. 
     Hereinafter, an operation of the profile configuration unit  140  will be described in detail referring to  FIGS. 2 to 5 . 
     Referring to  FIG. 2 , inside a box marked with the reference number  200  is one profile. 
     A profile called ‘Card’ is included in project ‘CHES2011’. The start process of the ‘Card’ profile is a process of collecting a waveform in the waveform collection unit  110  using the oscilloscope. 
     Thereafter, it may be seen that several preprocessing processes and analysis processes are connected. The connection between each process may be made by dragging and dropping each process in a process list of left box marked with the reference number  300  shown in  FIG. 3 . Further, if each process is clicked, parameters of each process appear in a property editor window (Property Editor) of right box marked with the reference number  302  shown in  FIG. 3 , and the value of the parameters may be set. 
     Further, each process may be individually operated by command icons  400  included under a process as shown in  FIG. 4 , and all processes included in the profile may be simultaneously operated by profile command in  FIG. 3 . 
     As shown in  FIGS. 2 and 3 , in analyzing one analysis device, one profile is made, connections between processes of collecting a waveform, processes of preprocessing and analyzing may be clearly seen, and if each process is selected, parameters of the selected process appear in the property window thus may be easily seen. Further, since the result waveform of each process (a waveform collection process and a preprocessing process) or the result of analysis is easily seen, know-how of analysis may be easily instructed although the profile is not one&#39;s own profile but an instructed profile because. 
       FIG. 5  is a diagram showing a structure of a profile in accordance with the embodiment of the present invention. 
     As shown in  FIG. 5 , a project  500  about the side channel analysis exists at the top level, and a plurality of profiles  502  are included in the project  500 . 
     Further, a waveform collection process  504 , a preprocessing process  506 , and an analysis process  508  exist in a lower level of each profile  502 . 
     Therefore, the result waveform of each process (the waveform collection process and the preprocessing process) or the result of analysis may be easily understood and, know-how of the analysis may be easily instructed although the profile is not one&#39;s own profile but an instructed profile. 
     As described above, if an analysis method for the side channel analysis of one apparatus to be analyzed is instructed to a side channel certification authority by making a profile, each side channel certification authority may easily understand the method for the side channel analysis of the device through the profile. At this time, if the profile is initialized, the result waveform of each process is reset. Thereafter, if the profile is driven by connecting the waveform collection device with the device to be analyzed, the same result as that of the instructed certification authority may be obtained. Therefore, know-how of the analysis may be easily instructed. 
     Further, it is possible to make all processes of a side channel analysis of collecting, preprocessing, analyzing a waveform and the like easily understood through referring to the profile by making each process of the side channel analysis into a process through collecting, preprocessing, and analyzing a waveform in a side channel analysis system, making a profile for managing each process by connection of each process, thus enabling a parameter used in each process and each waveform of operation result of each process to be easily confirmed. 
     While the invention has been shown and described with respect to the embodiments, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.