Substitution boxes are the key factor in symmetric-key cryptosystems that determines their
ability to resist various cryptanalytic attacks. Creating strong substitution boxes that have …

IoT is one of the most popular technologies in recent years due to the interconnection of
various infrastructures, physical devices, and software. To guarantee the security of Internet …

Substitution-boxes are the main deciding components in symmetric-key cryptosystems for
resisting many cryptanalytic attacks. It has been a challenging task for the designers to …

Substitution boxes are very important for cryptographic structures. But getting an 8-bit strong
s-box is a difficult problem. To address this problem, a new approach is proposed in this …

One of the first and most used hashing algorithms in blockchains is SHA-256 so the main
aim of this paper is how to increase the security level of the blockchain based on the …

Globally, advanced technologies play a vital role to offer services to the user. But the major
issue raised here is that the data utilization rate increasing day by day which causes attacks …

The confidentiality of images is crucial in medical, military, satellite, and IoT fields.
Encipherment ensures confidentiality, relying on strong Substitution boxes (S-boxes) and …

With the advancement in information and communication technologies (ICTs), the
widespread dissemination and sharing of digital images has raised concerns regarding …

This paper introduces the process of digital signatures and their importance in smart
contracts. There are a lot of digital signature algorithms. Some of these algorithms, such as …

Due to privacy and sensitivity of the medical images, the creation of strong medical image
encryption schemes has gained the attention of cryptographers. In this study, a robust …