In this paper we categorise some of the challenges facing those building, deploying and using Public Key Infrastructures (PKIs). Our work is based upon a series of in-depth interviews and analysis. The aim of the work in this paper is twofold: to present the conclusions drawn from work that is based on years of practical experience of those in the field; to analyse those conclusions in order to highlight research avenues that will answer the challenges raised by those in industry.
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