I'd like to explain how easy it really is to send secure encrypted messages. But I have to explain how this works, because the basic knowledge is necessary, otherwise you can not understand that.
How does encryption work?
Basically, any file or text can be encrypted. This is done with the help of a “private” and a “public key”. Both are usually created by using a password or a character string and converting it with a certain value.
There are also various methods for doing this. However, this is not so important for my contribution and usually leads to confusion. In practice, for example, “123” becomes “2wAPySWF2 @ + $ ZmKr”. But the higher you operate encryption, 123 can also become a character string with 10.000 or more characters.
Bei PGP (Pretty Good Privacy) there is, as usual, the “public” and the “private” key that is calculated. These strings are, in turn, the password to encrypt files (you do that with the “public” key or to decrypt what you do with the “private” key.) So if you want to encrypt a file that you only open yourself can. You only use your own key pair. But if you want to encrypt a file so that someone else can access it WITHOUT having your own “private” key, then you simply use the recipient's public key for it. You can also encrypt files for several people at the same time. You should never forget your own public key because you can only encrypt files for someone else, but then you will no longer have access to them.
As far as is understandable? It sounds more complicated than it actually is. But only with this knowledge can you understand and implement it.
I'm sorry, but this information is really important to understand how it works. The principle is always the same, regardless of whether one saves text, files or data which are then transferred.
Public key (for encryption) and
Private key (to decrypt)
There is always the "public" key that is used for encryption and the "private" one, and only with this can the file be made readable (decrypted) again!
As the name implies, the public key is not a secret, nor does it have to be, because it allows you to encrypt files but can not decrypt them anymore.
My “public PGP key” is:
—–BEGIN PGP PUBLIC KEY BLOCK—–
QFhaCCtEBBUIAgoDFgIBAhkBAhsDAh4BAAA6wg // bxDQ3dAHLQuLMacgKwG0
V5Xzz0B / fPhSQVyZjMEkdWVoBALLerRBmx + qXAqV97oRcjxTkvJepnYXSdGW
Pm1liGK + BFkQ0XXcdUEDlbDVkULWhmKSzTjLBy7fABEBAAHCwV8EGAEIABMF
AlbZYNEJEHlyQFhaCCtEAhsMAACfkg / 7BHSOSRdiiVuzND4dqN2PRDdelzlp
—–END PGP PUBLIC KEY BLOCK—–
This string was created from a password that I converted with 4096-bit. As briefly described in the example above. It is safe to access this key as it does not allow me to infer my “private” key.
Encrypt one now Text like “123”, then come out:
—–BEGIN PGP MESSAGE—–
sHc0eWQoBCpxxP6fcyVP9aQEaMV + + reZcQYFXqDAj qQPg4yKeZuTvTMn / KQQ
—–END PGP MESSAGE—–
So if you want to send an encrypted email, you also need the “public key” of the recipient. This is the only way to encrypt a text or file and the recipient can then open it again with his “private key”.
The “email” itself is not encrypted, because this file (the email itself is basically the envelope) must be readable. So of course the recipient must be legible, just like a letter envelope, for everyone. But the content is “encrypted” for yourself and the recipient as explained in the example above. It is important that you should know that everything you write in the subject of the email and that the sender and recipient are also visible to third parties.
So if you betray all the content in the subject, then you do not need to encrypt the content anymore!
There are two simple TIPS and examples of encrypted communication by e-mail.
Mailvelope and TutaNota.
Mailvelope is a PGP encryption tool that can be conveniently integrated into any Internet browser and is free. Thus, you can create your own key pairs, import and save public keys of others and encrypt or decrypt texts of emails directly. This is handy if you use any webmail service. It does not matter which one!
TutaNota is a free email service that encrypts messages and lets them send them to others, WITHOUT encrypting them themselves. This happens by simply storing the message encrypted when it is sent to TutaNota. The recipient only receives a notification that an encrypted message has been made available to him and he then has to enter a password to open it, which the sender and recipient have previously shared (NOT by EMAIL!). This can always be the same password and even if it is not smart, "123" would also work.
Or you can combine both. Encrypt the content of the message via Mailvelope with PGP and then send it encrypted to the recipient 🙂
I hope that this information is helpful and I look forward to your encrypted message via email! You can reach me with my public PGP key and / or via my email address: email@example.com