External resources
PGP: An email encryption software
Why and how to use openPGP ?
https://theprivacyguide.org/tutorials/pgp.html
Signal
An encrypted chat application
https://signal.org/
Public-key cryptography (PKC)
Definition and explanation of Public-key Cryptography on Wikipedia
https://en.wikipedia.org/wiki/Public-key_cryptography
Public key infrastructure
Definition of Public-key infrastructure on Wikipedia
https://en.wikipedia.org/wiki/Public_key_infrastructure
Cryptography
Definition of Cryptography on Wikipedia
https://en.wikipedia.org/wiki/Cryptography
History of cryptography
The history of Cryptography on Wikipedia
https://en.wikipedia.org/wiki/History_of_cryptography
