Ayuninggati, T. ., E. . Purnama Harahap, Mulyati, and R. Junior. “Supply Chain Management, Certificate Management at the Transportation Layer Security in Charge of Security”. 2021. Blockchain Frontier Technology, vol. 1, no. 01, June 2021, pp. 1-12, doi:10.34306/bfront.v1i01.3.