This article presents an overview of image transformation with a secret key and its
applications. Image transformation with a secret key enables us not only to protect visual …

A block scrambling-based encryption scheme is presented to enhance the security of
Encryption-then-Compression (EtC) systems with JPEG compression, which allow us to …

Compression and encryption are often performed together for image sharing and/or storage.
The order in which the two operations are carried out affects the overall efficiency of digital …

In this paper, we propose a novel defensive transformation that enables us to maintain a
high classification accuracy under the use of both clean images and adversarial examples …

We present a novel privacy-preserving scheme for deep neural networks (DNNs) that
enables us not to only apply images without visual information to DNNs for both training and …

Perceptual encryption (PE) hides the identifiable information of an image in such a way that
its intrinsic characteristics remain intact. This recognizable perceptual quality can be used to …

We propose a novel image transformation network for generating visually protected images
for privacy-preserving deep neural networks (DNNs). The proposed transformation network …

A novel grayscale-based block scrambling image encryption scheme is presented not only
to enhance security, but also to improve the compression performance for Encryption-then …

An encryption scheme of JPEG images in the bitstream domain is proposed. The proposed
scheme preserves the JPEG format even after encrypting the images, and the file size of …

The rising popularity of social networks and cloud computing has greatly increased a
number of JPEG compressed image exchanges. In this context, the security of the …