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This article mainly introduces the example analysis of GPG encryption in Linux, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

GPG can be used to sign and encrypt data. It is convenient for the sender and receiver to encrypt the data and confirm the identity of the other party. GPG uses symmetric encryption to encrypt large chunks of content, while asymmetric encryption uses asymmetric encryption to exchange keys for symmetric encryption.

Under Ubuntu, you can encrypt and decrypt files with the GPG command, and GPG is pre-installed for almost every distribution.

Gpg-c file # encrypts a file and generates a file.gpggpg file.gpg # decryption file.gpg to restore to a file file

Common basic commands

Gpg-- gen-key # generate key pair gpg-- list-keys # View existing key gpg-- delete-secret-keys # Delete private key gpg-- delete-key # Delete public key gpg-- armor-- output public.key-- export # Export private key gpg-- armor-- output private.key-- export-secret-keys # Export public key gpg-- keyserver hkp://keyserver.ubuntu.com:11371-- send-keys # upload the public key to the server

When generating the secret key, it gets stuck after the following prompt appears.

We need to generate a lot of random bytes. It is a good idea to performsome other action (type on the keyboard, move the mouse, utilize thedisks) during the prime generation; this gives the random numbergenerator a better chance to gain enough entropy.

Manually install the following software to solve the problem!

Sudo apt install rng-tools

Here's how I generated the key pair locally and sent the public key to the server.

Public key servers: http://keys.gnupg.net/, http://keyserver.ubuntu.com:11371/

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