This paper analyzes the problems in image encryption and decryption based on chaos theory. This article introduces the application of the two-stage Logistic algorithm in image encryption and decryption, then by inform...This paper analyzes the problems in image encryption and decryption based on chaos theory. This article introduces the application of the two-stage Logistic algorithm in image encryption and decryption, then by information entropy analysis it is concluded that the security of this algorithm is higher compared with the original image;And a new image encryption and decryption algorithm based on the combination of two-stage Logistic mapping and <i>M</i> sequence is proposed. This new algorithm is very sensitive to keys;the key space is large and its security is higher than two-stage Logistic mapping of image encryption and decryption technology.展开更多
This paper proposes a secure approach for encryption and decryption of digital images with chaotic map lattices. In the proposed encryption process, eight different types of operations are used to encrypt the pixels o...This paper proposes a secure approach for encryption and decryption of digital images with chaotic map lattices. In the proposed encryption process, eight different types of operations are used to encrypt the pixels of an image and one of them will be used for particular pixels decided by the outcome of the chaotic map lattices. To make the cipher more robust against any attacks, the secret key is modified after encrypting each block of sixteen pixels of the image. The experimental results and security analysis show that the proposed image encryption scheme achieves high security and efficiency.展开更多
In many applications, it is necessary to transmit images at a remote station, where wired Internet service is not available. In this case, wireless local loop (WLL) can help in making wireless link between one end nod...In many applications, it is necessary to transmit images at a remote station, where wired Internet service is not available. In this case, wireless local loop (WLL) can help in making wireless link between one end node of the internet and remote service center. In such link, the communication is heavily affected by large and small scale fading;hence the received signal experiences huge distortion in case of forward error correction. Otherwise, huge service delay arises due to frequent negative acknowledgements. To combat the situation, we can choose Alamouti channel of full rate and fully orthogonal space-time block code (OSTBC). Our aim is to transmit images through Alamouti channel and to observe the quality of the recovered image, in context of bit error rate (BER). We have also observed the impact of fading and additive white Gaussian noise (AWGN) on the image without application of error correction or detection technique of channel coding. To ensure security, we apply the RSA algorithm on each pixel prior transmitting and decrypt them at the receiving end, where we found no impairment from the algorithm. Finally, we observe that the relative performance of the system changes digital modulation schemes.展开更多
In the era of big data,image security and real-time processing become more and more important and increasingly difficult to satisfy.To improve the security and processing efficiency of image encryption algorithm,an en...In the era of big data,image security and real-time processing become more and more important and increasingly difficult to satisfy.To improve the security and processing efficiency of image encryption algorithm,an enhanced quantum scheme is proposed for generalized novel enhanced quantum image representation.The proposed quantum encryption scheme mainly consists of two-stage operation in order,i.e.,twice scrambling based generalized Arnold transform and pixel encryption based on the quantum key image(which are generated and prepared based on Logistic map).In the first stage,generalized Arnold transform are employed to simultaneously disturb the coordinate information and pixel gray value of quantum plain image.Following that,the scrambled image is further encrypted into a quantum cipher image based on quantum key image,which is divided into three sub-processes in detail,i.e.,CNOT operations,bit-plane scrambling and controlled perfect shuffle permutations are executed orderly.The quantum image decryption process can be easily implemented in a reverse way.The complete quantum circuit implementation for above two stages operation is constructed and analyzed in terms of quantum cost and time complexity.Compared to classical image processing algorithm,the investigated quantum encryption algorithm demonstrates an exponential speedup with computational cost of O(n)for a 2^(n)×2^(n) quantum grayscale or color images.The proposed scheme is simulated and verified on a classical computer with MATLAB environments,i.e.,not in a real quantum version that not considers the effects of quantum noise.Experimental results and numerical analysis indicate that the presented quantum algorithm has good visual effects and high security.展开更多
For complex-valued or quaternionic neural networks,scholars and researchers usually decompose them into real-valued systems.The decomposed real-valued systems are equiv-alent to original systems.Then,the dynamical beh...For complex-valued or quaternionic neural networks,scholars and researchers usually decompose them into real-valued systems.The decomposed real-valued systems are equiv-alent to original systems.Then,the dynamical behaviors of real-valued systems obtained are investigated,including stability,synchronization,and chaos etc.In this paper,a class of quaternionic neural networks with time-varying delays is investigated.First,by designing a suitable PI controller,synchronization of the considered chaotic system is realized.By using a non-decomposition method and structuring a novel Lyapunov functional,sufficient conditions are derived to guarantee synchronization between the drive-response systems.It is worth mentioning that,unlike other methods,our approach does not require break-ing down the quaternionic neural networks into four separate real-valued systems.Fur-thermore,we demonstrate the practical application of these chaotic quaternionic neural networks with time-varying delays in image encryption and decryption.Based on one se-quence of chaotic signal from state trajectory of single quaternion-valued neuron and a new encryption algorithm,the application of chaotic system proposed,that is,image encryp-tion,is researched.The process of image decryption is simply the reverse of the encryption process.Finally,numerical simulation examples are provided to validate the effectiveness of the designed PI controller and performance of image encryption and decryption.展开更多
文摘This paper analyzes the problems in image encryption and decryption based on chaos theory. This article introduces the application of the two-stage Logistic algorithm in image encryption and decryption, then by information entropy analysis it is concluded that the security of this algorithm is higher compared with the original image;And a new image encryption and decryption algorithm based on the combination of two-stage Logistic mapping and <i>M</i> sequence is proposed. This new algorithm is very sensitive to keys;the key space is large and its security is higher than two-stage Logistic mapping of image encryption and decryption technology.
基金supported by the National Natural Science Foundation of China (Grant Nos. 61001099 and 10971120)the Foundation for the Author of National Excellent Doctoral Dissertation of China (Grant No. 200444)
文摘This paper proposes a secure approach for encryption and decryption of digital images with chaotic map lattices. In the proposed encryption process, eight different types of operations are used to encrypt the pixels of an image and one of them will be used for particular pixels decided by the outcome of the chaotic map lattices. To make the cipher more robust against any attacks, the secret key is modified after encrypting each block of sixteen pixels of the image. The experimental results and security analysis show that the proposed image encryption scheme achieves high security and efficiency.
文摘In many applications, it is necessary to transmit images at a remote station, where wired Internet service is not available. In this case, wireless local loop (WLL) can help in making wireless link between one end node of the internet and remote service center. In such link, the communication is heavily affected by large and small scale fading;hence the received signal experiences huge distortion in case of forward error correction. Otherwise, huge service delay arises due to frequent negative acknowledgements. To combat the situation, we can choose Alamouti channel of full rate and fully orthogonal space-time block code (OSTBC). Our aim is to transmit images through Alamouti channel and to observe the quality of the recovered image, in context of bit error rate (BER). We have also observed the impact of fading and additive white Gaussian noise (AWGN) on the image without application of error correction or detection technique of channel coding. To ensure security, we apply the RSA algorithm on each pixel prior transmitting and decrypt them at the receiving end, where we found no impairment from the algorithm. Finally, we observe that the relative performance of the system changes digital modulation schemes.
基金supported by the National Key R&D Plan under Grant No.2018YFC1200200 and 2018YFC1200205.
文摘In the era of big data,image security and real-time processing become more and more important and increasingly difficult to satisfy.To improve the security and processing efficiency of image encryption algorithm,an enhanced quantum scheme is proposed for generalized novel enhanced quantum image representation.The proposed quantum encryption scheme mainly consists of two-stage operation in order,i.e.,twice scrambling based generalized Arnold transform and pixel encryption based on the quantum key image(which are generated and prepared based on Logistic map).In the first stage,generalized Arnold transform are employed to simultaneously disturb the coordinate information and pixel gray value of quantum plain image.Following that,the scrambled image is further encrypted into a quantum cipher image based on quantum key image,which is divided into three sub-processes in detail,i.e.,CNOT operations,bit-plane scrambling and controlled perfect shuffle permutations are executed orderly.The quantum image decryption process can be easily implemented in a reverse way.The complete quantum circuit implementation for above two stages operation is constructed and analyzed in terms of quantum cost and time complexity.Compared to classical image processing algorithm,the investigated quantum encryption algorithm demonstrates an exponential speedup with computational cost of O(n)for a 2^(n)×2^(n) quantum grayscale or color images.The proposed scheme is simulated and verified on a classical computer with MATLAB environments,i.e.,not in a real quantum version that not considers the effects of quantum noise.Experimental results and numerical analysis indicate that the presented quantum algorithm has good visual effects and high security.
基金funded by the Scientific Research Program Funded by the Shaanxi Provincial Education Department(Grant No.23JK0550)by the Natural Science Basic Research Program of Shaanxi Province(Grant Nos.2024JC-YBQN-0726,2024JCYBMS-352 and 2023-JC-QN-0001)+2 种基金by the Qin Chuangyuan"Scientists+Engineers"Team Construction in Shaanxi Province(Grant No.2022KXJ-38)by the Xi'an Science and Technology Program(Grant No.2022JH-RGZN-0041)by the Xi'an Science and Technology Program(Grant No.23ZDCYJSGG0025-2022).
文摘For complex-valued or quaternionic neural networks,scholars and researchers usually decompose them into real-valued systems.The decomposed real-valued systems are equiv-alent to original systems.Then,the dynamical behaviors of real-valued systems obtained are investigated,including stability,synchronization,and chaos etc.In this paper,a class of quaternionic neural networks with time-varying delays is investigated.First,by designing a suitable PI controller,synchronization of the considered chaotic system is realized.By using a non-decomposition method and structuring a novel Lyapunov functional,sufficient conditions are derived to guarantee synchronization between the drive-response systems.It is worth mentioning that,unlike other methods,our approach does not require break-ing down the quaternionic neural networks into four separate real-valued systems.Fur-thermore,we demonstrate the practical application of these chaotic quaternionic neural networks with time-varying delays in image encryption and decryption.Based on one se-quence of chaotic signal from state trajectory of single quaternion-valued neuron and a new encryption algorithm,the application of chaotic system proposed,that is,image encryp-tion,is researched.The process of image decryption is simply the reverse of the encryption process.Finally,numerical simulation examples are provided to validate the effectiveness of the designed PI controller and performance of image encryption and decryption.
