## 4 System Methodology
### Proposed System Workflow
#### 4.2.2 Phase 2: Registration and Key Generation
Furthermore, our proposed scheme is limited only to informal discussions of security features. In the future, rigorous and formal security analysis using an appropriate threat model and verification tool will be performed. Conceptualization, M.S.R. ; Data curation, N.I. ; Formal analysis, N.I., M.S.R. and M.N.A.S. ; Funding acquisition, Y.-Z.C. ; Methodology, N.I. and M.S.R. ; Resources, I.M. ; Supervision, M.S.R. ; Validation, N.I. ; Visualization, M.N.A.S. ; Writing--original draft, N.I. and M.S.R. ; Writing--review & editing, I.M. and Y.-Z.C. All authors have read and agreed to the published version of the manuscript. This research was supported in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (No. NRF-2018 RIA6A1A03025109), and by the National Research Foundation of Korea (NRF) grant funded by the Korean government (No. NRF-2019 RIA2C1006249). Not applicable. The authors declare that there is no conflict of interest in this paper. ## References

* [PERSON] and [PERSON] (2019) [PERSON]; [PERSON] Key Management Systems for Smart Grid Advanced Metering Infrastructure: A Survey. IEEE Commun. Surv. Tututor. **2019**, _21_, 2831-2848. [CrossRef]
* [PERSON] (2022) [PERSON] Domestic Electricity Meter Types in Operation Great Britain. Available online: [[https://www.statista.com/statistics/79](https://www.statista.com/statistics/79)]([https://www.statista.com/statistics/79](https://www.statista.com/statistics/79)) 1967/domestic-electricity-meter-types-in-operation-great-britain/ (accessed on 5 June 2022). * U.S. Smart Meter Data Management Market. Available online: [[https://www.alliedmarketresearch.com/us-smart-meter-data-management-market](https://www.alliedmarketresearch.com/us-smart-meter-data-management-market)]([https://www.alliedmarketresearch.com/us-smart-meter-data-management-market](https://www.alliedmarketresearch.com/us-smart-meter-data-management-market)) (accessed on 5 June 2022). * Global Smart Electricity Meters Market Trends Report (2020) Global Smart Electricity Meters Market Trends Report (2020). Available online: [[https://www.grandviewresearch.com/industry-analysis/smart-meters-market](https://www.grandviewresearch.com/industry-analysis/smart-meters-market)]([https://www.grandviewresearch.com/industry-analysis/smart-meters-market](https://www.grandviewresearch.com/industry-analysis/smart-meters-market)) (accessed on 7 December 2021). * [PERSON] et al. (2021) [PERSON]; [PERSON]; [PERSON] HKMS-AMI: A Hybrid Key Management Scheme for AMI Secure Communication. In Proceedings of the International Conference on Trends in Computational and Cognitive Engineering, Online, 21-22 October 2021; pp. 383-392. * [PERSON] and [PERSON] (1979) [PERSON] _Secrecy, Authentication, and Public Key Systems_; Stanford University: Stanford, CA, USA, 1979. * [PERSON] (1990) [PERSON]; [PERSON] How to time-stamp a digital document. In Proceedings of the Conference on the Theory and Application of Cryptography, Aarhus, Denmark, 21-24 May 1990; pp. 437-455. * [PERSON] and [PERSON] (2015) [PERSON]; [PERSON] Secure anonymous key distribution scheme for smart grid. IEEE Trans. Smart Grid **2015**, \(7\), 906-914. [CrossRef]
* [PERSON] et al. (2016) [PERSON]; [PERSON]; [PERSON]; [PERSON] Secure and scalable data collection with time minimization in the smart grid. IEEE Trans. Smart Grid **2016**, \(7\), 43-54. [CrossRef]
* [PERSON] et al. (2017) [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] An efficient and light asymmetric cryptography to secure communication in smart grid. In Proceedings of the 2017 IEEE International Conference on Smart Energy Grid Engineering (SEGE), Oshawa, ON, Canada, 14-17 August 2017; pp. 248-252. * [PERSON] and [PERSON] (2018) [PERSON]; [PERSON] [PERSON] Hybrid Cryptography Algorithm with Precomputation for Advanced Metering Infrastructure Networks. Mob. Netw. Appl. **2018**, _23_, 982-993. [CrossRef]
* [PERSON] et al.