If you really loves Linux or more familiar with it and want to communicate securely between two Linux machine then follow the simple steps as bellow. In windows you can also communicate securely.
1. First Generate public/private key pair using sshd-generate on both Linux machine.
To work securely with Linux,first of all we need to generate public/private key pair as mentioned bellow. It will generate keypair and also shows random-art image of the key.
2. Start ssh service on both Linux machines.
Now next step is to perform initialization of secure shell (ssh) i.e. to start ssh on both machine.
3. Use GNUPG (GNU Privacy Guard) one machine.
GnuPG allows to encrypt and sign your data and communication.GnuPG is also known as GPG.
Select kind of key you want.
Select Size Of Key.
Select Validation Period for Key.
Add Identity of user to identify your key like name,comment,email etc.
Press O if you are done with that and finally you need pass-phrase to protect your secret key.
As the system require lot of random bytes so ,do some other interactive task like open other application or type on keyboard until OS collects the more entropy.
4. Export Public key pub.asc as bellow.
now its time to export the public key as pub.asc.
5. Export Private key pri.asc as bellow.
As we have performed export for public key as pub.asc above, we need to perform export step for private key as pri.asc also.
6. Copy public key from one machine to other machine using scp as bellow.
now by using scp(secured copy) function we need to copy public key from one Linux machine to another one.
7. Import pub.asc(public key) on other side.
As we have copied public key in previous step,now import that public key.
8. encryption at other side.
make a file test.txt and write something inside that.Now encrypt that file content as mentioned.
9.Encrypted file as .gpg extension.
Now you can see the encrypted content as bellow as test.txt.gpg.
10.Transfer the encrypted file.
transfer encrypted file to other side or on another linux machine using scp.
11.import pub.asc on other Linux machine.
You cans see the content of the transferred file as in encrypted form.now its time to import the public key on local machine for further communication.
12. decrypt on one side.
Now we are going to decrypt the test.txt.gpg file on another side using gpg -d test.txt.gpg and now you can see the original document content.
This is how encryption and decryption performed between two Linux machine using PGP/GPG.
You can also perform ssh and scp from local to remote machine without password.
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