Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BlockPKI: An Automated, Resilient, and Transparent Public-Key
  Infrastructure   This paper describes BlockPKI, a blockchain-based public-key infrastructure
that enables an automated, resilient, and transparent issuance of digital
certificates. Our goal is to address several shortcomings of the current TLS
infrastructure and its proposed extensions. In particular, we aim at reducing
the power of individual certification authorities and make their actions
publicly visible and accountable, without introducing yet another trusted third
party. To demonstrate the benefits and practicality of our system, we present
evaluation results and describe our prototype implementation.

8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th