Simeck32/64 algorithm is a lightweight encryption algorithm have no replacement and substitution operation. Therefore, in this paper, under the condition that intermediate value information and plaintext ciphertext are unknown, only get electromagnetic leakage data of the copy of the equipment of, we use these data trained a deep learning model of to attack the last 48bit simeck 32/64, so as to realize a “blind” gray box bypass electromagnetic attack algorithm based on deep learning.
With the rapid development of communication and computer, the individual identification technology of communication equipment has been brought to many application scenarios. The identification of the same type of electronic equipment is of considerable significance, whether it is the identification of friend or foe in military applications, identity determination, radio spectrum management in civil applications, equipment fault diagnosis, and so on. Because of the limited-expression ability of the traditional electromagnetic signal representation methods in the face of complex signals, a new method of individual identification of the same equipment of communication equipment based on deep learning is proposed. The contents of this paper include the following aspects: (1) Considering the shortcomings of deep learning in processing small sample data, this paper provides a universal and robust feature template for signal data. This paper constructs a relatively complete signal template library from multiple perspectives, such as time domain and transform domain features, combined with high-order statistical analysis. Based on the inspiration of the image texture feature, characteristics of amplitude histogram of signal and the signal amplitude co-occurrence matrix (SACM) are proposed in this paper. These signal features can be used as a signal fingerprint template for individual identification. (2) Considering the limitation of the recognition rate of a single classifier, using the integrated classifier has achieved better generalization ability. The final average accuracy of 5 NRF24LE1 modules is up to 98% and solved the problem of individual identification of the same equipment of communication equipment under the condition of the small sample, low signal-to-noise ratio.
In respect to the influence of ultra wide-band electromagnetic pulse on unmanned aerial data link system, an electromagnetic effect test was carried out, the influence law was obtained, and the protection suggestions were given. First, the intensities of ultra wide-band radiation field at different distances were measured. Then the corresponding relationship between electromagnetic environment and fault phenomenon of data link system was obtained under different radiation field intensities, different repetition frequencies and different data link states. Experimental data show that the data link system, as the hardcore of unmanned aerial vehicle, is susceptible to strong electromagnetic pulse interference. Front door coupling is the main coupling path for the interference to unmanned aerial vehicle's main remote control data link, so it is necessary to install protection module on RF front-end to improve the anti-damage capability. The back door coupling phenomenon is also serious, so shielding, grounding and filtering methods must be comprehensively adopted for total security.
The influence of microwave pulse power on the burnout effect of the AlGaN/GaN high electron mobility transistor (HEMT) in a low noise amplifier (LNA) is studied. The LNA constructed by an AlGaN/GaN HEMT is modeled by using our independent-developed device-circuit joint simulator. The correctness of our simulator is verified by comparing the simulated DC characteristics of the studied HEMT by using our simulator and two kinds of commercial software. The simulated gains obtained by using our simulator and the commercial software ADS are in agreement with the measured results. The results show that the relationship between the injected power and the actual absorbed power satisfies a linear relationship, and the burnout time decreases with the increase of the injected power.
A low-profile broadband circular patch antenna that can excite TM 11 and TM12 modes is proposed. The proposed antenna mainly consists of an annular slotted circular radiation patch, a metal ground, a set of shorting pins, and a vertical grounded balun feeding structure. One side of the vertical feeding substrate is slotted ground and the other side is a microstrip feeding line. A cross-shaped slot is introduced on the circular radiation patch, it improves the impedance matching of the antenna significantly. With a profile of 0.063 λ0 (λ0 is the center operating wavelength in the free space), the -10 dB impedance operating band is 3.49-5.5 GHz and the relative bandwidth is 44.7%.
A 4×4 slot antenna array is designed. The overall dimension of the antenna array is 176mm×176mm×1mm. The top surface of the ground with 4×4 slots is printed on a F4BM dielectric substrate with a thickness of 1mm. The base surface of the substrate is the feeding network. The antenna radiates in the axial direction with a 4mm thick metal substrate attached to the bottom of the feeding network. The working frequency of the antenna array is 3.83-3.99GHz, and gain is 13.41dBi. The simulation results show that the radiation characteristics of the antenna array are good.
We explore the potential of machine learning for relay selection in a cooperative multi-relay wiretap network with decode-and-forward (DF) protocol, aiming to enhance the physical layer security. Such network is divided into two scenarios according to whether the channel state information (CSI) of wiretap links is available or not for source, when it is assumed that the CSI of the main links has been known at the source. In addition, two machine learning-based schemes, namely, the convolutional neural network(CNN)-based multi-classifier and the support vector machine(SVM)-based multi-classifier, are proposed to characterize the conventional optimization problem of cooperative relay selection as a multi-classification problem in two scenarios mentioned above. In our study, we provide more insight into the spatial correlation of CSI and make the first attempt to introduce the CNN for relay selection in a cooperative multi-relay wiretap network. Finally, the simulation results indicate that two machine learning-based with relatively low selection complexity and less feedback amount achieve substantially the same secrecy performance as the conventional selection scheme.
Conventional correlation electromagnetic analysis (CEMA) usually exploits electromagnetic power consumption of single byte. The leakage model only chooses single byte as the attacking target, while regarding the other bytes as noise. This means that conventional leakage model has abandoned most of the information that can be available. In order to take full advantage of information, we proposed a more effective method against AES-128 by using multi-bytes to extract the key. From the result of our experiment performed on Sakura-G, fewer traces were required by multi-bytes CEMA than single byte analysis to recover the entire key correctly.
Since the 1969 Apollo 12 lightning strike incident, aerospace engineers have gradually realized of the importance of lightning protection for aerospace transportation system. Since then, lightning protection technology has been greatly developed. Until now, the United Stated and Russia both establish their own lightning protection design program and specifications. In the recent the Soyuz lightning strike incident, people can obviously find that the lightning current was thoroughly flowed away the whole launch vehicle when lightning strike to the launch vehicle, but the Soyuz stand the strong lightning current and lightning environment without any damage or hardware degrade, and successfully complete the launch mission, which indicated that the Soyuz takes lightning protection design on its design process and it achieves a high lightning protection performance. This paper takes launch vehicle as the discussion object, tracks some typical lightning strike incidents, and discusses the lightning protection design for aerospace transportation system both in the United State and Russia, which may provide enlightenment and ideas for lightning protection design of China's aerospace transportation system.
This paper designs a conductive HEMP pulse generator. The pulse generator is based on the Marx circuit structure, and is charged by a test transformer and a rectifier circuit, and a simple and stable trigger switch is designed. Simulation and testing show, the output pulse of generator is double exponential wave, which front edge time is about 20ns and the pulse width is about 600ns. By adjusting the switching air pressure and charging voltage, the output current peak is adjustable from 2.5 to 5 kA. The parameters basically meet the requirements of the standard.
In order to evaluate the passive intermodulation (PIM) level induced by metallic contact structure located in the radiation field near the receiving antenna, a calculation method for predicting the amplitude of PIM received by the antenna is proposed and demonstrated in the paper. Adopting the PIM point source model, and based on the simulating of carrier excitation current amplitude and intermodulation signal coupling efficiency to calculate PIM level of metal contact in radiation field. By employing the slotted waveguide tooling based on near-field coupling test principle, we measured the third-order passive intermodulation (PIM 3 ) level of the two copper wire contact junction located in the near-field radiation field of the slotted waveguide and analyzed its position distribution dependence. The experimental measured results are in good agreement with theoretical calculations, which validates the proposed calculation method of the PIM level induced by metallic contact junction in radiation field. This work provides an analytical method for its evaluating PIM products, and contributes to an in-depth understanding of the mechanism of PIM induced by metal contact in radiation field.
This paper presents a substrate integrated waveguide (SIW) bandpass filter with continuously tunable center frequency and tunable bandwidth (BW). The filter is based on combline SIW resonators loaded with varactors to tune the center frequency. Surface mount varactors between two coupled resonators control the inter-resonator coupling and tune the bandwidth. The varactors are also used to load the feedline to adjust the external coupling at different frequencies and bandwidths. A two-pole electrically reconfigurable bandpass filter is designed, simulated and optimized. The filter shows a 3 dB BW range of 82-260 MHz around 4.5 GHz, a 3 dB BW range of 40-170 MHz around 3.5 GHz and a 3 dB BW range of 75-90 MHz around 3 GHz with return loss better than 10 dB. The insertion loss range from 0.5 dB to 2 dB over the whole tuning range.
A modified dynamic deviation reduction (MDDR) based Volterra model for digital predistortion of power amplifiers is proposed in this paper. The MDDR model introduces the characteristics of generalized memory polynomial (GMP) model into dynamic deviation reduction (DDR) based Volterra model. Measurement results show that the MDDR model has better normalized mean-square error (NMSE) performance and adjacent channel power ratio (ACPR) performance than DDR model. And compare with GMP model, MDDR model has better NMSE performance and similar ACPR performance.
To the characteristics of the undertest SREMP electric field (rise time is shorter than 10ns, pulse width is wider than 1ms, field strength is higher than 100kV/m), a series of wide pulse and high field strength measurement systems were developed in the paper by theoretical analysis, simulation and circuit design. Performance test results show that the measurement system's rise time response is shorter than 5ns, and pulse width response is wider than 1ms. The dynamic range of measurement system is wider than 50dB, and the field strength measurement capability can be extended from 30V/m to1000kV/m. Using the developed series measurement systems interdependently, the pulsed electric field can be tested reliably.
In this paper, a tri-polarized MIMO antenna with diverse radiation properties for the 5G-V2X vehicular communication is proposed. The design consists of an omnidirectional monopole unit and two pairs of loop radiator dipoles. By loading eight pairs of double inverted L-shaped elements, the directional dipoles get wide-beamwidth characteristic for both E-plane and H-plane. Moreover, the larger inverted L elements lower the elevation angle of the main radiative direction of the monopole, which results in gain enhancement in the azimuth plane. For the directional cross-dipoles unit, two impedance bands reach 34.36% and 19.62% (VSWR<2). The half power beamwidths (HPBW) are 99° and 100° in E-Plane and H-Plane at 3.5 GHz, 119° and 95° in E-Plane and H-Plane at 4.9GHz, respectively. As for the omnidirectional monopole, it operates in 5.68-5.96 GHz (4.8%) with the gain of 2.50 ± 0.59dBi in the azimuth plane.
