Design and Smartphone Implementation of Chaotic Duplex H.264-Codec Video Communications

2021 ◽  
Vol 31 (03) ◽  
pp. 2150045
Author(s):  
Baoju Chen ◽  
Simin Yu ◽  
Zeqing Zhang ◽  
David Day-Uei Li ◽  
Jinhu Lü
Keyword(s):  
Real Time ◽  
Initial Conditions ◽  
Security Analysis ◽  
Divide And Conquer ◽  
Video Communications ◽  
Sinusoidal Modulation ◽  
Low Level ◽  
Modulo Operation ◽  
Communication Scheme ◽  
Known Plaintext Attack

In this paper, a chaotic duplex H.264-codec-based secure video communication scheme is designed and its smartphone implementation is also carried out. First, an improved self-synchronous chaotic stream cipher algorithm equipped with a sinusoidal modulation, a multiplication, a modulo operation and a round down operation (SCSCA-SMMR) is developed. Using the sinusoidal modulation and multiplication, the improved algorithm can resist the divide-and-conquer attack by traversing multiple nonzero component initial conditions (DCA-TMNCIC). Meanwhile, also by means of the round down operation and modulo operation, on the premise that the DCA-TMNCIC does not work, the original keys cannot be further deciphered only by the known-plaintext attack, the chosen-plaintext attack and the chosen-ciphertext attack, respectively. Then, the Android low-level multimedia support infrastructure MediaCodec class is used to access low-level media encoder/decoder components and the H.264 hardware encoding/decoding is performed on real-time videos, so the chaotic video encryption and decryption can be realized in real-time by smartphones. Security analysis and smartphone experimental results verify the effectiveness of the proposed method.

scholarly journals Cryptanalysis of Some Self-Synchronous Chaotic Stream Ciphers and Their Improved Schemes

2021 ◽  
Vol 31 (08) ◽  
pp. 2150142
Author(s):  
Baoju Chen ◽  
Simin Yu ◽  
David Day-Uei Li ◽  
Jinhu Lü
Keyword(s):  
Initial Conditions ◽  
Security Analysis ◽  
Stream Ciphers ◽  
Divide And Conquer ◽  
Sinusoidal Modulation ◽  
Nominal System ◽  
Nonzero Component ◽  
Chosen Ciphertext Attack

In this paper, a cryptanalysis method that combines a chosen-ciphertext attack with a divide-and-conquer attack by traversing multiple nonzero component initial conditions (DCA-TMNCIC) is proposed. The method is used for security analysis of [Formula: see text]-D ([Formula: see text]) self-synchronous chaotic stream ciphers that employ a product of two chaotic variables and three chaotic variables ([Formula: see text]-D SCSC-2 and [Formula: see text]-D SCSC-3), taking 3-D SCSC-2 as a typical example for cryptanalysis. For resisting the combinational effect of the chosen-ciphertext attack and DCA-TMNCIC, several improved chaotic cipher schemes are designed, including 3-D SCSC based on a nonlinear nominal system (3-D SCSC-NNS) and [Formula: see text]-D SCSC based on sinusoidal modulation ([Formula: see text]-D SCSC-SM ([Formula: see text])). Theoretical security analysis validates the improved schemes.

Design and SOPC-Based Realization of a Video Chaotic Secure Communication Scheme

2018 ◽  
Vol 28 (13) ◽  
pp. 1850160 ◽  
Author(s):  
Ping Chen ◽  
Simin Yu ◽  
Baoju Chen ◽  
Liangshan Xiao ◽  
Jinhu Lü
Keyword(s):  
Real Time ◽  
Secure Communication ◽  
Security Analysis ◽  
New Approach ◽  
Time Performance ◽  
Hardware Realization ◽  
Communication Scheme ◽  
Chaotic Secure Communication

This paper proposes a new approach for hardware realization based on a system with programmable chip (SOPC) technology. The main feature of the SOPC-based scheme is that it can make full use of both FPGA and ARM, where the FPGA is used for video capturing, displaying, encrypting and decrypting, the ARM is adopted for TCP/IP protocol, Ethernet sending and receiving. SOPC technology gives full play to the advantages of both FPGA and ARM that complement each other, leading to better real-time performance and is more convenient for hardware realization. In addition, some results of security analysis are also given. Hardware realization results verify the feasibility and effectiveness of the proposed SOPC-based approach.

Cryptanalysis of a Chaotic Stream Cipher and Its Improved Scheme

2018 ◽  
Vol 28 (07) ◽  
pp. 1850086 ◽  
Author(s):  
Zhuosheng Lin ◽  
Simin Yu ◽  
Xiutao Feng ◽  
Jinhu Lü
Keyword(s):  
Stream Cipher ◽  
Initial Conditions ◽  
Divide And Conquer ◽  
State Variables ◽  
Nonlinear Functions ◽  
Secret Keys ◽  
Multiple State ◽  
Nonlinear Operation ◽  
Known Plaintext Attack ◽  
Chosen Ciphertext Attack

In this paper, the security performance for an 8D self-synchronous and feedback-based chaotic stream cipher with the low 8 bits of state variables for encryption is analyzed. According to known-plaintext attack and divide-and-conquer attack, only the second plain-pixel and its corresponding cipher-pixel are required to decipher the secret keys [Formula: see text] [Formula: see text] by properly setting 64 different kinds of initial conditions. Then, according to chosen-ciphertext attack and divide-and-conquer attack, it is found that under the condition of selecting the ciphertext as zero, the original chaotic equation is degenerated as a linear one. So, by setting appropriate initial conditions, the secret keys [Formula: see text] [Formula: see text] can be deciphered with only four iterative operations. As for the secret keys [Formula: see text] [Formula: see text] multiplied by ciphertext and the secret keys [Formula: see text] [Formula: see text] related to nonlinear functions, maybe a more powerful attack method is required for these secret keys to be deciphered. Finally, an improved chaotic stream cipher scheme equipped with the low 8 bits derived from nonlinear operation of multiple state variables for encryption is proposed for improving the ability to resist divide-and-conquer attack and chosen-ciphertext attack.

scholarly journals Handling Initial Conditions in Vector Fitting for Real Time Modeling of Power System Dynamics

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2471
Author(s):  
Tommaso Bradde ◽  
Samuel Chevalier ◽  
Marco De Stefano ◽  
Stefano Grivet-Talocia ◽  
Luca Daniel
Keyword(s):  
Dynamical Systems ◽  
Power System ◽  
System Dynamics ◽  
Real Time ◽  
Initial Conditions ◽  
Test System ◽  
Initial State ◽  
Power System Dynamics ◽  
Vector Fitting ◽  
Time Modeling

This paper develops a predictive modeling algorithm, denoted as Real-Time Vector Fitting (RTVF), which is capable of approximating the real-time linearized dynamics of multi-input multi-output (MIMO) dynamical systems via rational transfer function matrices. Based on a generalization of the well-known Time-Domain Vector Fitting (TDVF) algorithm, RTVF is suitable for online modeling of dynamical systems which experience both initial-state decay contributions in the measured output signals and concurrently active input signals. These adaptations were specifically contrived to meet the needs currently present in the electrical power systems community, where real-time modeling of low frequency power system dynamics is becoming an increasingly coveted tool by power system operators. After introducing and validating the RTVF scheme on synthetic test cases, this paper presents a series of numerical tests on high-order closed-loop generator systems in the IEEE 39-bus test system.

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