Electronic mails need to be encrypted if you need true privacy when communicating. Encryption is the most practical and effective way of fighting surveillance and privacy violations by the state or any malicious actors like intelligence agencies (unwarranted eavesdropping) and black-hat crackers.
Electronic Mail Encryption can be done using the open implementation of Pretty Good Privacy (PGP, written by Phil Zimmermann) called GNU Privacy Guard (GPG) authored by Werner Koch and others.
Creating a public key pair:
A public key pair is a pair of keys: A public key and a private key. As the name makes it obvious, you keep the private key to yourself and give out the public key. You can create a key pair like so:
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oogenhand 