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 …

An essential part of cloud computing, IoT, and in general the broad field of digital systems, is
constituted by the mechanisms which provide access to a number of services or …

Reversible data hiding in encrypted images (RDHEI) is an effective technique to embed data
in the encrypted domain. An original image is encrypted with a secret key and during or after …

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 …

This paper proposes a novel scheme of reversible data hiding in encrypted images using
distributed source coding. After the original image is encrypted by the content owner using a …

We initiate the cryptographic study of order-preserving symmetric encryption (OPE), a
primitive suggested in the database community by Agrawal et al.(SIGMOD'04) for allowing …

Content-based image retrieval (CBIR) uses image content features to search and retrieve
digital images from a large database. A variety of visual feature extraction techniques have …

Face recognition is increasingly deployed as a means to unobtrusively verify the identity of
people. The widespread use of biometrics raises important privacy concerns, in particular if …

In recent years, signal processing applications that deal with user-related data have aroused
privacy concerns. For instance, face recognition and personalized recommendations rely on …

This chapter provides an accessible introduction for point processes, and especially Hawkes
processes, for modeling discrete, inter-dependent events over continuous time. We start by …