Global Public Key Infrastructure Market by Component (Solution and Services (Professional and Managed), Deployment Type (On-Premise, Cloud),by Organization Size (Small and Medium-sized Enterprises (SMEs), Large Enterprises), by Industry Vertical (BFSI, Telecom and IT, Retail and e-commerce, Healthcare and Life Sciences, Manufacturing and Automotive, Education, Government and Defense, Others), and Regional Forecasts 2021-2027