Images contain very sensitive and confidential information. Because images play a
significant role in many applications such as military communication, remote‐sensing, and …

Secure communication is of great importance in the modern world. Many methods,
techniques, and systems are used for secure communication, many of which cannot be used …

With quaternion theory, the traditional discrete fractional Tchebyshev transform is extended
to the quaternion algebra domain for multi-image processing. A new multi-image encryption …

It is well known that chaos is unpredictability and sensitivity to initial values and parameters.
It is a best choice for cryptography application. However, the existing chaotic cryptography …

Some existing image encryption schemes based on chaotic systems have various security
defects, such as non-uniform distribution of the chaotic system's phase trajectory, narrow …

A new image encryption scheme is presented by combining six-dimensional non-
degenerate discrete hyper-chaotic system, two-dimensional discrete cosine Stockwell …

In the age of Information Technology, the day-life required transmitting millions of images
between users. Securing these images is essential. Digital image encryption is a well-known …

In recent years, image encryption schemes based on optical methods have been extensively
studied. However, possible optical encryption methods in combination with fractional-order …

The fractional-order chaotic systems have characteristics of the all chaotic systems,
however, the improper fractional-order chaotic systems have more complexity random …

In this paper, a novel grayscale image cryptosystem based on hybrid chaotic maps is
proposed. The scheme employs both confusion phase to scramble the location of pixels and …