Quantum Asymmetric Encryption

Chuyue Pan, Tao Shang, Jianwei Liu

Shi-Jin Zhong, Jin-Huan Li, Ying-Nan Zhao +2 more

Abstract The quantum asymmetric key encryption (QAKE) is a prominent research frontier in quantum information. In this paper, we propose a quantum asymmetric key encryption scheme based on the exact quantum search algorithm (QAKE-EQSA). Leveraging EQSA’s deterministic amplitude amplification and a unique three-oracle structure, comprising an auxiliary oracle, its inverse, and a message-dependent oracle, the proposed QAKE-EQSA scheme guarantees a 100% decryption success rate. Within the scheme, the public key is generated by applying the auxiliary oracle to a specific quantum superposition state and subsequently shared via a public key center; the private key is constructed using a phase-matching diffusion operator; and the message is encoded into a unique target state within the search space, ensuring that only the legitimate receiver can recover it exactly. Furthermore, we demonstrate a 4-qubit instantiation of the QAKE-EQSA scheme on the MindQuantum platform and conduct a comprehensive analysis encompassing its security, qubit efficiency, and practical performance. Our analysis demonstrates that, in comparison to several existing QPKE schemes, the proposed QAKE-EQSA scheme achieves exact decryption, optimal qubit efficiency, and enhanced resistance against quantum attacks.

Tao Shang

І.Д. Горбенко, О.Г. Качко, O.M. Oleksijchuk +5 more

The asymmetric encryption and keys encapsulation in polynomial rings (algebraic lattices) built algorithms are presented and considered, the essence of used asymmetric encryption transformations and key encapsulation protocols are analyzed. Encryption and encapsulation mechanisms with different sets of parameters that determine stability are considered.

Luis Antonio Guisso Lopes luis.guisso

Wenjing Li, Qinghai Ou, Hongfa Li +4 more

Here, The new arbitrated quantum signature (AQS) protocol assisted by asymmetric key based on qubit block encryption algorithm is given. Interestingly, our protocol with the asymmetric key can be easily extended to multi-party verification. Unlike all previous quantum works on arbitrated quantum signature, the encryption algorithm of the pre-sented protocol is qubit block encryption. Since, the proposed protocol has a better performance in resisting existential forgery attack. In addi-tion, with the help of the arbitrator, it can be proved that our protocol is secure.