Encryption Archives - IEEE Transactions on Quantum Engineering

Quantum Attacks on HCTR and Its Variants

Recently, in Asiacrypt 2019, Bonnetain et al. have shown attacks by quantum adversaries on FX construction and Even-Mansour Cipher without using superposition queries to the encryption oracle. In this article, we use a similar approach to mount new attacks on Hash-Counter (HCTR) and Hash-Counter-Hash (HCH) constructions. In addition, we mount attacks on HCTR, tweakable-HCTR, and […]

Reducing the Cost of Implementing the Advanced Encryption Standard as a Quantum Circuit

January 16, 2020Brandon Langenberg; Hai Pham; Rainer SteinwandtOpen Access, Quantum SoftwareEncryption, Logic gates, NIST, Qubit, Wires

To quantify security levels in a postquantum scenario, it is common to use the quantum resources needed to attack the Advanced Encryption Standard (AES) as a reference value. Specifically, in the National Institute of Standards and Technology’s ongoing postquantum standardization effort, different security categories are defined that reflect the quantum resources needed to attack AES-128, […]