Double Encryption Using Trigonometric Chaotic Map and XOR of an Image

In the most recent decades,a major number of image encryption plans have been proposed.The vast majority of these plans reached a highsecurity level;however,their moderate speeds because of their complicated processes made them of no use in real-time applications.Inspired by this,we propose another efficient and rapid image encryption plan dependent on the Trigonometric chaotic guide.In contrast to the most of current plans,we utilize this basic map to create just a couple of arbitrary rows and columns.Moreover,to additionally speed up,we raise the processing unit from the pixel level to the row/column level.The security of the new plot is accomplished through a substitution permutation network,where we apply a circular shift of rows and columns to break the solid connection of neighboring pixels.At that point,we join the XOR operation with modulo function to cover the pixels values and forestall any leaking of data.High-security tests and simulation analyses are carried out to exhibit that the scheme is very secure and exceptionally quick for real-time image processing at 80 fps(frames per second).

Double quantum images encryption scheme based on chaotic system

This paper explores a double quantum images representation(DNEQR)model that allows for simultaneous storage of two digital images in a quantum superposition state.Additionally,a new type of two-dimensional hyperchaotic system based on sine and logistic maps is investigated,offering a wider parameter space and better chaotic behavior compared to the sine and logistic maps.Based on the DNEQR model and the hyperchaotic system,a double quantum images encryption algorithm is proposed.Firstly,two classical plaintext images are transformed into quantum states using the DNEQR model.Then,the proposed hyperchaotic system is employed to iteratively generate pseudo-random sequences.These chaotic sequences are utilized to perform pixel value and position operations on the quantum image,resulting in changes to both pixel values and positions.Finally,the ciphertext image can be obtained by qubit-level diffusion using two XOR operations between the position-permutated image and the pseudo-random sequences.The corresponding quantum circuits are also given.Experimental results demonstrate that the proposed scheme ensures the security of the images during transmission,improves the encryption efficiency,and enhances anti-interference and anti-attack capabilities.

Attack on Optical Double Random Phase Encryption Based on the Principle of Ptychographical Imaging

The principle of ptychography is applied in known plain text attack on the double random phase encoding （DRPE） system. We find that with several pairs of plain texts and cipher texts, the model of attack on DRPE can be converted to the model of ptyehographical imaging. Owing to the inherent merits of the ptyehographical imaging, the DRPE system can be breached totally in a fast and nearly perfect way, which is unavailable for currently existing attack methods. Further, since the decryption keys can be seen as an object to be imaged from the perspective of imaging, the ptychographical technique may be a kind of new direction to further analysis of the security of other encryption systems based on double random keys.

Self-powered bifunctional perovskite photodetectors with both broadband and narrowband photoresponse

Photodetectors generally operate exclusively in either the broadband or narrowband.Developing bifunctional photodetectors that can detect photons in both broadband and narrowband would bring significant versatility to the optoelectronic platform.Nevertheless,the design of bifunctional integrated devices remains challenging due to the differentiated strategies with respect to device structure and material combination.Herein,we propose introducing polyvinylpyrrolidone to increase the viscosity of the perovskite precursor solution,which introduces abundant defects and cavities into the perovskite film while maintaining a relatively low film thickness.Then,we use methylamine gas to postprocess the middle area of the film to promote directional recrystallization and densification,thereby realizing narrowband and broadband dualfunction photodetection in a single device at zero bias.Both ends of the film exhibit a near-infrared peak response at 780 nm with a narrow full-width at half maximum of approximately 30 nm without an external bias.The middle broadband photodetector exhibits a high responsivity of 329 mA W^(-1)and EQE up to 52.46%at 780 nm.We make full use of narrow-band wavelength selective detection and broadband full-spectrum detection to achieve double encryption during signal transmission.This work represents an important step toward the realization of perovskite-based multifunctional integrated devices.