Takanori Isobe

ShiftRows Alternatives for AES-like Ciphers and Optimal Cell Permutations for Midori and Skinny

2018 · IACR Transactions on Symmetric Cryptology

We study possible alternatives for ShiftRows to be used as cell permutations in AES-like ciphers. As observed during the design process of the block cipher Midori, when using a matrix with a non-optimal branch number …

Security Evaluation of Initialization Phases and Round Functions of Rocca and AEGIS

2022 · IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences

Authenticated-Encryption with Associated-Data (AEAD) plays an important role in guaranteeing confidentiality, integrity, and authenticity in network communications. To meet the requirements of high-performance applications, several AEADs make use of AES New Instructions (AES-NI), which can …

Implementing Grover’s on AES-based AEAD schemes

2024 · Scientific Reports

Extensive research is currently underway to determine the security of existing ciphers in light of the advancements in quantum computing. Against symmetric key cryptography, Grover’s search algorithm is a prominent attack, capable of reducing search …