Cryptography and Data Security Based on Information Theory

Computer science, mathematics, and communication theory are a few axes of information theory. In computer science, cryptography refers to the art of using mathematics and science for secure communication, as well as being the foundation for privacy and communication security. Basically, the security of any cryptographic system can rely either on the computational infeasibility of breaking it, or on the theoretical impossibility of breaking it (even using infinite computational power), which is called information theoretic security. Recently, researchers have become more interested in the latter approach, whereas computational security relies on an unproven intractability assumption and is less practical. Information theory has several typical applications in cryptography, such as allowing us to prove the unconditional security of cryptographic systems and acting as a crucial tool in reduction proofs, showing that breaking a cryptographic system is as hard as breaking an underlying cryptographic primitive. Thus, information theory and cryptographic systems are inseparable topics in security research areas, offering a wide range of research themes.

Cryptographic protocols and systems depend on cryptographic primitives and associated algorithms as their basic building blocks. A few common examples of such primitives are digital signatures, one-way hash functions, ciphers, secret sharing, and public key cryptography, although the terminology ‘primitive’ may vary depending on the point of view. Besides this, the popularity of clouds for providing various services has continued to grow at a rapid pace. Cloud storage enables users to store their sensitive data and exchange it with others. In spite of the advantages, security is the most relevant and crucial matter in the widespread adoption of cloud-based services, as well as in network and IoT security. Regardless of the advances in this research area, important research problems still remain open; for instance, blockchain is receiving serious attention.

The aim of this Special Issue is to invite researchers to share their recent progress in cryptography and security research areas, addressing both theoretical and practical aspects.

Prof. Dr. Yasuyuki Nogami
Guest Editor

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• cryptographic primitives
• protocol security
• cloud security
• network security
• advanced cryptography
• IoT security