Provisioning Cybersecurity in ICT Complex Supply Chains: An Overview, Key Issues and a Relevant Architecture - Masip-Bruin, Xavi; Mar{\'ın-Tordera, Eva; José Ruiz; Admela Jukan; Trakadas, Panagiotis; Ales Cernivec; Antonio Lioy; López, Diego; Henrique Santos; Antonis Gonos; others (Preprints, 2021)