SPDX-FileCopyrightText © 2025 Menacit AB <foss@menacit.se> SPDX-License-Identifier CC-BY-SA-4.0 title Practical cryptography course: Reflections exercise author Joel Rangsmo <joel@menacit.se> footer © Course authors (CC BY-SA 4.0) description Reflections exercise for the practical cryptography course keywords cryptology cryptography practical encryption course color #ffffff class invert style section.center { text-align: center; } Reflections exercise What we learned so far? Answer the following questions How could PoW be used to combat spam? Why do some backup solutions make use of public key cryptography? Why do software devs publish file hashes? Why is asymmetric cryptography used for "COVID vaccination certificates" printed on paper? Take the chance to be a bit --verbose! courses+crypto_013001@%EMAIL_DOMAIN%