The PGP Key Server: Challenge Manual

@InProceedings{VTLTC2020/Manual,
  crossref  = {VTLTC2020},
  pages={17--26},
  booktitle = {VerifyThis Long-term Challenge: Proceedings},
  editor = {Marieke Huismann and Ra\'{u}l E. Monti and Mattias Ulbrich and Alexander Weigl},
  year = 2020,
  author={Marieke Huisman and {Ra\'{u}l} E. Monti and Mattias Ulbrich and Alexander Weigl},
  title={{The PGP Key Server: Challenge Manual}}
}```