CN114062749A - Multichannel bypass signal acquisition system - Google Patents
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Abstract
The invention discloses a multichannel bypass signal acquisition system which comprises a computer, an oscilloscope, an EM probe and a password chip. After a user sets parameters of the system, triggering the oscilloscope to be in a working state; the computer sends the plaintext to the password chip through the serial port, and after the password chip encrypts the plaintext, the ciphertext is returned to the computer through the serial port; the oscilloscope samples the signals of the password chip through the EM probe, and the probe feeds the sampled signals back to the oscilloscope; the oscilloscope processes the feedback signal into binary data and returns the binary data to the computer. The system provided by the invention runs on a personal computer, can realize the acquisition of bypass signals by matching with a corresponding oscilloscope, does not need to additionally manufacture special conversion equipment, and is simple and convenient to operate; compared with the method for acquiring single physical information leakage, the system can acquire electromagnetic signals of more channels, and improves the acquisition efficiency and stability of electromagnetic bypass signals, so that the security evaluation is performed on the password chip more comprehensively.
Description
Technical Field
The invention belongs to the field of signal acquisition, and particularly relates to a multichannel bypass signal acquisition system.
Background
With the development of electronic information technology, embedded systems and electronic devices are widely used, and the systems and the devices contain much personal information. In order to prevent privacy disclosure and protect information security, a cryptographic module is usually used on these devices to run an encryption algorithm such as AES, RSA, SM4, etc. to perform encryption protection on personal information. As the cryptographic modules are usually built on a physical platform, part of electromagnetic signal bypass information leaked during running comprises encryption information, and the cryptographic system can be cracked by collecting the bypass information by using a side channel attack method. Therefore, electromagnetic signals need to be collected when evaluating the security of embedded systems and devices. The current acquisition tool generally uses Openchoice developed by Taker, which has slow response speed, can only acquire data of one frame at a time, has a complex interface and is inconvenient to use. Secondly, because the acquired electromagnetic signals are generated when the equipment runs an encryption algorithm, the equipment needs to send plaintext to the equipment to encrypt before acquiring data each time, and the mode of once encrypting and once acquiring is not high enough in acquisition efficiency for users who need to acquire data in batches. In addition, the current oscilloscope is independent of a computer when collecting data, and the operation of collecting data mainly depends on the direct operation of a user on the oscilloscope, so that the control of the acquisition process of the oscilloscope and the serial port communication of the computer cannot be synchronized.
Disclosure of Invention
The invention aims to provide a multichannel bypass signal acquisition system aiming at the problems in the prior art.
The technical solution for realizing the purpose of the invention is as follows: a multichannel bypass signal acquisition system comprises a computer, an oscilloscope, an EM probe and a password chip, wherein the computer is connected with the oscilloscope through a network cable, the computer is connected with the password chip through a USB cable, and the EM probe is connected with the oscilloscope;
a user triggers the oscilloscope to be in a working state after setting necessary parameters for the system; meanwhile, the computer sends the plaintext to the password chip for encryption through the serial port, and the password chip returns the ciphertext to the computer through the serial port after completing the encryption of the plaintext; the oscilloscope samples signals of the password chip through the connected EM probe, and the probe feeds the sampled signals back to the oscilloscope; the oscilloscope processes the feedback signal into binary data and returns the binary data to the computer, and the system binary data stream is converted into floating point data and stored into a csv file.
Further, the system is architecturally composed of an interface control layer and a communication control layer;
the interface control layer is a system operation interface, and interaction of the communication control layer is realized through a visual interface;
the communication control layer comprises an oscilloscope and a computer serial port control, the communication control layer realizes the connection of the computer serial port and the oscilloscope, and calls an oscilloscope driving program on a system operation interface to realize the control of the system on the oscilloscope and return data required by the interface control layer.
Further, the interface control layer includes:
the serial port setting module is used for controlling the serial port and setting serial port information;
the sampling setting module is used for setting a communication channel and sampling information;
the data sending module is used for sending a plaintext to the password chip;
the data receiving module is used for receiving the ciphertext returned by the password chip;
and the waveform acquisition module is used for acquiring waveform data of the signal of the password chip sampled by the oscilloscope.
Further, the serial port setting module includes:
the first unit is used for selecting a working serial port;
the second unit is used for selecting the baud rate;
and the third unit is used for starting or closing the serial port.
Further, the sampling setting module includes:
the channel selection unit is used for selecting a channel of the oscilloscope;
and the sampling frequency input unit is used for setting the sampling frequency.
Further, the data sending module comprises:
an input unit for inputting an encryption mode code;
a data generation unit for generating a plaintext of an encryption algorithm based on the code input by the input unit and a random algorithm;
and the sending unit is used for sending the encryption mode and the plaintext to the password chip.
Further, the interface control layer further includes:
the acquisition state display module is used for displaying the state acquired by the waveform acquisition module, and specifically comprises: when the waveform acquisition module works, the acquisition is displayed; and when the sampling times of the waveform acquisition module reach the sampling times, displaying that the sampling is finished.
Further, the communication control layer includes:
the command sending module is used for sending an SCPI command for collecting data to the oscilloscope under the triggering of the waveform collecting module;
and the data processing module is used for processing the data acquired by the waveform acquisition module to generate a waveform file in a csv file format.
Further, the communication control layer further includes:
the network port starting module is used for opening a network port when the external equipment is communicated with the oscilloscope;
and the network port closing module is used for closing the network port when the external equipment and the oscilloscope finish communication.
Compared with the prior art, the invention has the following remarkable advantages: 1) the system runs on a personal computer, can realize the acquisition of bypass signals by matching with a corresponding oscilloscope, has general adaptability, can realize the control of the oscilloscope by the computer without additionally manufacturing special conversion equipment, and is simple and convenient to operate; compared with the situation that only single physical information leakage can be collected when the oscilloscope is used independently, the system can collect electromagnetic signals of more channels, and the collection efficiency and stability of electromagnetic bypass signals are improved, so that the security evaluation is carried out on the password chip more comprehensively; 2) the system connects the oscilloscope and the computer into a system, integrates serial port communication and oscilloscope control into an operation interface, and is different from the independent use mode of the oscilloscope in that: after the oscilloscope and the computer are connected into a system, the system can control the oscilloscope at a computer end, and can set the sampling rate of one-time data acquisition and the times of automatic sampling; 3) the system can automatically generate a plaintext and send the plaintext to equipment for encryption, and simultaneously controls the oscilloscope to acquire electromagnetic signals in the encryption process, so that the acquisition efficiency is improved.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
Fig. 1 is a communication diagram of a multi-channel bypass signal acquisition system in one embodiment.
FIG. 2 is a schematic diagram of an interface control layer in one embodiment.
FIG. 3 is a diagram illustrating serial communications in one embodiment.
FIG. 4 is a schematic diagram of oscilloscope communications, according to one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that if the description of "first", "second", etc. is provided in the embodiment of the present invention, the description of "first", "second", etc. is only for descriptive purposes and is not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In one embodiment, in combination with fig. 1, a multichannel bypass signal acquisition system is provided, the system includes a computer, an oscilloscope, an EM probe and a password chip, the computer and the oscilloscope are connected through a network cable, the computer and the password chip are connected through a USB cable, and the EM probe is connected to the oscilloscope;
a user triggers the oscilloscope to be in a working state after setting necessary parameters for the system; meanwhile, the computer sends the plaintext to the password chip for encryption through the serial port, and the password chip returns the ciphertext to the computer through the serial port after completing the encryption of the plaintext; the oscilloscope samples signals of the password chip through the connected EM probe, and the probe feeds the sampled signals back to the oscilloscope; the oscilloscope processes the feedback signal into binary data and returns the binary data to the computer, and the system binary data stream is converted into floating point data and stored into a csv file.
Further, in one embodiment, the system is architecturally comprised of an interface control layer and a communication control layer;
the interface control layer is a system operation interface, and interaction of the communication control layer is realized through a visual interface;
the communication control layer comprises an oscilloscope and a computer serial port control, the communication control layer realizes the connection of the computer serial port and the oscilloscope, and calls an oscilloscope driving program on a system operation interface to realize the control of the system on the oscilloscope and return data required by the interface control layer.
Further, in one embodiment, the interface control layer comprises:
the serial port setting module is used for controlling the serial port and setting serial port information;
the sampling setting module is used for setting a communication channel and sampling information;
the data sending module is used for sending a plaintext to the password chip;
the data receiving module is used for receiving the ciphertext returned by the password chip;
and the waveform acquisition module is used for acquiring waveform data of the signal of the password chip sampled by the oscilloscope.
Further, in one embodiment, the serial port setting module includes:
the first unit is used for selecting a working serial port;
the second unit is used for selecting the baud rate;
and the third unit is used for starting or closing the serial port.
Further, in one embodiment, the sample setting module includes:
the channel selection unit is used for selecting a channel of the oscilloscope;
and the sampling frequency input unit is used for setting the sampling frequency.
Further, in one embodiment, the data sending module includes:
an input unit for inputting an encryption mode code;
a data generation unit for generating a plaintext of an encryption algorithm based on the code input by the input unit and a random algorithm;
and the sending unit is used for sending the encryption mode and the plaintext to the password chip.
Further, in one embodiment, the interface control layer further includes:
the acquisition state display module is used for displaying the state acquired by the waveform acquisition module, and specifically comprises: when the waveform acquisition module works, the acquisition is displayed; and when the sampling times of the waveform acquisition module reach the sampling times, displaying that the sampling is finished.
Further, in one embodiment, the communication control layer comprises:
the command sending module is used for sending an SCPI command for collecting data to the oscilloscope under the triggering of the waveform collecting module;
and the data processing module is used for processing the data acquired by the waveform acquisition module to generate a waveform file in a csv file format.
Further, in one embodiment, the communication control layer further includes:
the network port starting module is used for opening a network port when the external equipment is communicated with the oscilloscope;
and the network port closing module is used for closing the network port when the external equipment and the oscilloscope finish communication.
Illustratively, in one embodiment, the system comprises an operation interface module, a serial port communication module and an oscilloscope communication module.
With reference to fig. 2, a main operation interface of the system is designed, the system interface is implemented by using a graphical interface of Visual Studio, components such as button, label, combbox, textbox and the like are generated through system.
Based on the above, the system comprises the following steps:
(1) and selecting a serial port and a baud rate of the computer in communication with the password chip on an operation interface of the system, and clicking to open the serial port lock after the selection is finished.
(2) The channel is selected, and because a multi-channel bypass signal acquisition system is designed, a CH1 channel and a CH2 channel can be selected according to actual requirements, or both the channels are selected, if two channels are selected, two probes are required to be installed on an oscilloscope, and the acquisition times are required to be designated while the channels are selected.
(3) An encryption mode code is entered in the text box, for example 81 is the code of the AES encryption protocol agreed upon by the system. The plaintext generally has 16 bytes, the system adopts random function generation, and user input is not needed, so that the signal acquisition efficiency can be improved. The encrypted ciphertext can be seen to return at the receiving box, indicating that the encryption was successful. And returning the acquired state in the acquisition state box, and popping up the acquired character pattern in the text box after the acquisition of the number of times of the encryption required by the user input is finished.
Further specifically, with reference to fig. 3, the serial port communication module needs to implement the following functions:
(1) opening a serial port, and clicking the opened serial port to open the serial port needing communication;
(2) selecting a serial port, and selecting the serial port which can be identified by the current password chip in a pull-down frame mode;
(3) selecting a baud rate, and selecting the baud rate capable of communicating with the baud rate through a pull-down menu;
(4) transmitting data, inputting plaintext with a corresponding format in a text box, wherein the plaintext is automatically generated by a random algorithm, and considering that the plaintext lengths of different encryption algorithms are different, an encryption mode represented by one byte needs to be sent firstly during communication, and then the plaintext is sent;
(5) receiving a ciphertext, and receiving the ciphertext returned by the crypto chip by the system;
(6) the serial port is closed, and under the condition of opening the serial port, the serial port is closed when communication is not needed;
the above functions are implemented by calling the SerialPort control controlling the serial port in C #.
The oscilloscope communication needs to call a transmission interface of the oscilloscope to obtain sampling data, the system uses the oscilloscope of MDO3104 model produced by Tektronix, a computer user end controls and accesses the oscilloscope through a Tektiananet.dll dynamic link library provided by Tektronix officially, and fig. 4 shows the specific functions needed to be realized by the oscilloscope communication module.
(1) And opening the network port, and when an instrument is connected with the oscilloscope through a network cable, opening the network port.
(2) And connecting the oscilloscope, and connecting the oscilloscope through an interface provided by the VISA resource manager after the oscilloscope is connected.
(3) Data is collected, and an order for collecting data is input to the oscilloscope by inputting an SCPI (Standard Commands for Programmable instruments) order, so as to obtain oscilloscope data.
(4) And (4) data processing, wherein the data returned by the oscilloscope is binary data, so that the data is processed to generate a waveform file in a csv file format.
(5) And closing the network port, and closing the communication of the network port after the communication with the oscilloscope is completed.
The visa (virtual Instrument architecture) virtual Instrument Software architecture used above is an advanced application programming interface for interacting with various Instrument buses, and can be used for configuring, programming and debugging USB, serial ports, GPIB and ethernet systems. And the oscilloscope sampling can be realized by calling the related program control function set. SCPI (standard command for programmable instruments) is an ASCII-based instrument programming language for use with test and measurement instruments.
In conclusion, the system provided by the invention runs on a personal computer, can realize the acquisition of the bypass signal by matching with a corresponding oscilloscope, does not need to additionally manufacture special conversion equipment, and is simple and convenient to operate; compared with the method for acquiring single physical information leakage, the system can acquire electromagnetic signals of more channels, and improves the acquisition efficiency and stability of electromagnetic bypass signals, so that the security evaluation is performed on the password chip more comprehensively.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A multichannel bypass signal acquisition system is characterized by comprising a computer, an oscilloscope, an EM probe and a password chip, wherein the computer is connected with the oscilloscope through a network cable, the computer is connected with the password chip through a USB cable, and the EM probe is connected with the oscilloscope;
a user triggers the oscilloscope to be in a working state after setting necessary parameters for the system; meanwhile, the computer sends the plaintext to the password chip for encryption through the serial port, and the password chip returns the ciphertext to the computer through the serial port after completing the encryption of the plaintext; the oscilloscope samples signals of the password chip through the connected EM probe, and the probe feeds the sampled signals back to the oscilloscope; the oscilloscope processes the feedback signal into binary data and returns the binary data to the computer, and the system binary data stream is converted into floating point data and stored into a csv file.
2. The multi-channel bypass signal acquisition system according to claim 1, wherein the system is architecturally comprised of an interface control layer and a communication control layer;
the interface control layer is a system operation interface, and interaction of the communication control layer is realized through a visual interface;
the communication control layer comprises an oscilloscope and a computer serial port control, the communication control layer realizes the connection of the computer serial port and the oscilloscope, and calls an oscilloscope driving program on a system operation interface to realize the control of the system on the oscilloscope and return data required by the interface control layer.
3. The multi-channel bypass signal acquisition system according to claim 1 or 2, wherein the interface control layer comprises:
the serial port setting module is used for controlling the serial port and setting serial port information;
the sampling setting module is used for setting a communication channel and sampling information;
the data sending module is used for sending a plaintext to the password chip;
the data receiving module is used for receiving the ciphertext returned by the password chip;
and the waveform acquisition module is used for acquiring waveform data of the signal of the password chip sampled by the oscilloscope.
4. The multi-channel bypass signal acquisition system of claim 3, wherein the serial port setup module comprises:
the first unit is used for selecting a working serial port;
the second unit is used for selecting the baud rate;
and the third unit is used for starting or closing the serial port.
5. The multi-channel bypass signal acquisition system of claim 3, wherein the sample setting module comprises:
the channel selection unit is used for selecting a channel of the oscilloscope;
and the sampling frequency input unit is used for setting the sampling frequency.
6. The multi-channel bypass signal acquisition system according to claim 3, wherein the data transmission module comprises:
an input unit for inputting an encryption mode code;
a data generation unit for generating a plaintext of an encryption algorithm based on the code input by the input unit and a random algorithm;
and the sending unit is used for sending the encryption mode and the plaintext to the password chip.
7. The multi-channel bypass signal acquisition system of claim 3, wherein the interface control layer further comprises:
the acquisition state display module is used for displaying the state acquired by the waveform acquisition module, and specifically comprises: when the waveform acquisition module works, the acquisition is displayed; and when the sampling times of the waveform acquisition module reach the sampling times, displaying that the sampling is finished.
8. The multi-channel bypass signal acquisition system of claim 3 wherein the communication control layer comprises:
the command sending module is used for sending an SCPI command for collecting data to the oscilloscope under the triggering of the waveform collecting module;
and the data processing module is used for processing the data acquired by the waveform acquisition module to generate a waveform file in a csv file format.
9. The multi-channel bypass signal acquisition system of claim 8 wherein the communication control layer further comprises:
the network port starting module is used for opening a network port when the external equipment is communicated with the oscilloscope;
and the network port closing module is used for closing the network port when the external equipment and the oscilloscope finish communication.
10. The multi-channel by-pass signal acquisition system of claim 1 wherein the oscilloscope is an oscilloscope model MDO3104 manufactured by Tektronix, and the oscilloscope is controlled and accessed by a computer through a tektiananet.dll dynamically linked library officially provided by Tektronix.
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