2.3QUANT-PHOct 20, 2020
On the lightweight authenticated semi-quantum key distribution protocol without Trojan horse attackJun Gu, Tzonelih Hwang
Recently, Tsai et al. (Laser Phys. Lett. 17, 075202, 2020) proposed a lightweight authenticated semi-quantum key distribution protocol for a quantum participant to share a secret key with a classical participant. However, this study points out that an attacker can use a modification attack to make both participants share a wrong key without being detected. To avoid this problem, an improvement is proposed here.
1.2QUANT-PHOct 7, 2020
Two attacks and counterattacks on the mutual semi-quantum key agreement protocol using Bell statesJun Gu, Tzonelih Hwang
Recently, a mutual semi-quantum key agreement protocol using Bell states is proposed by Yan et al. (Mod. Phys. Lett. A, 34, 1950294, 2019). The proposed protocol tries to help a quantum participant share a key with a classical participant who just has limited quantum capacities. Yan et al. claimed that both the participants have the same influence on the final shared key. However, this study points out that the classical participant can manipulate the final shared key by himself/herself without being detected. To solve this problem, an improved method is proposed here.