3 papers
quant-ph2026
Quantum secure blind decryption with two users
Masahito Hayashi, Yuki Ito
We propose two types of protocols for quantum secure blind decryption, involving two users and servers. User 1 holds the encrypted ciphertext. The servers store several indexed key…
quant-ph2025
Verifier-initiated quantum message-authentication via quantum zero-knowledge proofs
Wusheng Wang, Masahito Hayashi
On-demand authentication is critical for scalable quantum systems, yet current approaches require the signer to initiate communication, creating unnecessary overhead. We introduce…
quant-ph2025
Quantum digital signature based on single-qubit without a trusted third-party
Wusheng Wang, Masahito Hayashi
Digital signatures are a powerful cryptographic tool widely employed across various industries for securely authenticating the identity of a signer during communication between sig…