36 citations · 73 across the 18 of their papers we have counts for
4 papers · 1 filter
Multi-Copy Security in Quantum Cryptography and More
Alper Çakan, Vipul Goyal, Fuyuki Kitagawa +2
Unclonable cryptography uses the quantum no-cloning principle to achieve security guarantees that are impossible in a classical world. Most existing works, however, consider only s…
Collusion-Resistant Quantum Secure Key Leasing Beyond Decryption
Fuyuki Kitagawa, Ryo Nishimaki, Nikhil Pappu
Secure key leasing (SKL) enables the holder of a secret key for a cryptographic function to temporarily lease the key using quantum information. Later, the recipient can produce a…
MicroCrypt Assumptions with Quantum Input Sampling and Pseudodeterminism: Constructions and Separations
Mohammed Barhoush, Ryo Nishimaki, Takashi Yamakawa
We investigate two natural relaxations of quantum cryptographic primitives. The first involves quantum input sampling, where inputs are generated by a quantum algorithm rather than…
PKE and ABE with Collusion-Resistant Secure Key Leasing
Fuyuki Kitagawa, Ryo Nishimaki, Nikhil Pappu
Secure key leasing (SKL) is an advanced encryption functionality that allows a secret key holder to generate a quantum decryption key and securely lease it to a user. Once the user…