State of the Art in Cryptography Theory and Techniques

Dear Colleagues,

Modern cryptography is undergoing a profound transformation driven by emerging computational paradigms, advanced communication infrastructures, and rapidly evolving security threats. As digital systems continue to expand in scale, intelligence, and interconnectedness, cryptography must provide not only stronger security guarantees but also improved efficiency, adaptability, and provable robustness. This Special Issue, “State of the Art in Cryptography Theory and Techniques,” seeks to present the most recent theoretical developments and practical breakthroughs that will shape the next generation of secure systems.

The ongoing standardization of post-quantum cryptography (PQC) marks one of the most significant shifts in the field's history. Lattice-based constructions, code-based signatures, isogeny-based schemes, and hash-based primitives are redefining the landscape of public-key cryptography. Yet major challenges remain—from reducing key sizes and improving performance to strengthening security proofs and understanding structural hardness assumptions. At the same time, symmetric cryptography continues to advance through lightweight designs, new permutation-based modes, improved differential and linear cryptanalysis, and enhanced provable bounds.

Beyond individual primitives, modern systems increasingly rely on advanced cryptographic techniques such as secure multiparty computation (MPC), zero-knowledge proofs (ZKPs), fully homomorphic encryption (FHE), oblivious transfer, and verifiable computation. These tools are becoming central to privacy-preserving AI, blockchain security, secure cloud computing, and large-scale authentication ecosystems. As these protocols grow more widely deployed, the need for stronger adversarial models, tighter proofs, and more efficient constructions becomes even more pressing.

In parallel, the integration of cryptography with communication theory, distributed systems, and quantum information is accelerating. Topics such as cryptographic key exchange in high-mobility networks, threshold cryptography for distributed trust, randomness extraction in noisy environments, and quantum-resistant multiparty protocols demonstrate the growing interdisciplinary nature of contemporary research.

This Special Issue invites high-quality original research and comprehensive surveys that push the boundaries of cryptographic theory and practice. Submissions may address foundational models, complexity-theoretic assumptions, protocol design, algorithmic optimizations, or real-world implementations of cutting-edge cryptographic techniques.

Topics of interest include, but are not limited to:

• Post-quantum cryptographic primitives and protocols;
• Lattice-based, code-based, multivariate, and hash-based cryptosystems;
• Security reductions, hardness assumptions, and proof-technique innovations;
• Lightweight and high-performance cryptography for constrained environments;
• Symmetric-key design, analysis, and advanced cryptanalytic techniques;
• Zero-knowledge proofs, succinct proofs, and verifiable computation;
• Secure multiparty computation and privacy-preserving protocols;
• Fully homomorphic encryption and practical optimizations;
• Cryptographic protocol design for distributed and high-mobility systems;
• Blockchain security, consensus cryptography, and decentralized identity;
• Quantum-resistant authentication and key-exchange mechanisms;
• Randomness extraction, entropy analysis, and secure randomness generation;
• Cryptographic implementations, benchmarking, and side-channel resilience.

We look forward to receiving your contributions that advance the theoretical foundations and practical deployment of future-generation cryptographic techniques.

Dr. Wen-Bin Hsieh
Guest Editor

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