3 citations · 5 across the 8 of their papers we have counts for
14 papers
Eavesdropper-Blind Remote State Preparation and Applications to Quantum Public-Key Encryption
Kaniuar Bacho, Alexandru Cojocaru
Remote state preparation (RSP) is a central primitive in quantum cryptography, enabling classical parties to remotely construct quantum states using only classical communication. A…
Equivalence Between Average-Case Hardness of Learning and Cryptography for Mixed Quantum States
Alexandru Cojocaru, Laura Lewis
The relationship between cryptography and learning theory has long been a central theme in the foundations of theoretical computer science: cryptographic primitives can imply hardn…
Verified Pythagorean Composition for Adaptive Cryptographic Games: Noise Flooding in Homomorphic Encryption
Yi Lee, Alexandru Cojocaru, Junyi Liu +1
Noise flooding is a standard defense against decryption attacks on approximate homomorphic encryption, but its security proof is unusually sensitive to composition. Replacing each…
NISQ Security and Complexity via Simple Classical Reasoning
Alexandru Cojocaru, Juan Garay, Qipeng Liu +1
We give novel lifting theorems for security games in the quantum random oracle model (QROM) in Noisy Intermediate-Scale Quantum (NISQ) settings such as the hybrid query model, the…
Improved Quantum Lifting by Coherent Measure-and-Reprogram
Alexandru Cojocaru, Juan Garay, Qipeng Liu +1
We give a tighter lifting theorem for security games in the quantum random oracle model. At the core of our main result lies a novel measure-and-reprogram framework that we call co…
Quantum Lifting for Invertible Permutations and Ideal Ciphers
Alexandru Cojocaru, Minki Hhan, Qipeng Liu +2
In this work, we derive the first lifting theorems for establishing security in the quantum random permutation and ideal cipher models. These theorems relate the success probabilit…