3 papers
cs.CR2025
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…
quant-ph2022
Functional Encryption with Secure Key Leasing
Fuyuki Kitagawa, Ryo Nishimaki
Secure software leasing is a quantum cryptographic primitive that enables us to lease software to a user by encoding it into a quantum state. Secure software leasing has a mechanis…
quant-ph2022
Watermarking PRFs against Quantum Adversaries
Fuyuki Kitagawa, Ryo Nishimaki
We initiate the study of software watermarking against quantum adversaries. A quantum adversary generates a quantum state as a pirate software that potentially removes an embedded…