Help me understand PGP Messages

Okay so I am in the cock.li thread and I am trying to get into the invitation but I just don't understand how those PGP Message seem to work. Can someone help me out with it? please don't delete this thread for being low effort post.

You generate a pair of keys that have a special cryptographic relationship. One is the public key, the other the private key. You make your public key widely accessible by openly publishing it. Now if someone wants to send you an encrypted message they encrypt their plaintext message with your public key. Because the resulting ciphertext can only be decrypted with the corresponding private key, only you can decrypt it and therefore read it. This is based on asymmetric cryptography, using a different key for the encryption and decryption process, in contrast to symmetric cryptography where the same key is used for both processes.

>>66472 Not OP. So, if I want you to e-mail me back, I also have to send my public key with that message I sent you, right?

>>66470 Check out this guide: https://emailselfdefense.fsf.org/en/ >>66474 > I also have to send my public key with that message I sent you, right? Or upload your public key to a keyserver and/or your website. Remember to generate a revoke certificate (--gen-revoke) as well and keep a backup of it on a flash drive.

>>66472 From what I understood about PGP Keys, the one sending public keys is asking you to send a message to him. so the pgp messages in the cockli invite are asking you to send them invitation right?

>>66483 If you want to send email to Lain, you need to know Lain's public key (then she uses her private key to decrypt the email). No one should ever share their private key because then $anyone can use their identity and read their mail. GPG = free/libre implementation of PGP.

- There is a lock which has 2 keys. One to lock it and one to unlock it. - The lock is a standard algorithm that is available to everyone. - The key to lock it is the public key which you can reveal to anyone and share it publicly. - The key to unlock it is the private key that you do not share with anyone and not even transfer it over the internet. It always stays in your local environment (local disk or handwritten note). - In the cock.li thread you share your public key and the other user locks his invite (encrypts it) with your public key and the lock (pgp program on his machine). He sends that locked message (encrypted data) on the thread that can only be opened with your private key and a pgp program. - In case of https both your browser and the server share their public keys with each other. All the subsequent data your browser sends to the server is encrypted with the server's public key. And all the data server sends to your browser is encrypted with your public key that can only be opened by your browser. - Encrypted email, signal, whatsapp also does a similar thing.