Generate Key File Public Key File From Mac Secret

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The simplest way to generate a key pair is to run ssh-keygen without arguments. In this case, it will prompt for the file in which to store keys. Here's an example: klar (11:39) ssh-keygen Generating public/private rsa key pair.

Using GnuPG gpg command you can generate public and private keys. In this tutorial, we will use the keys generated by gpg command to send and receive encrypted files, and digitally sign a file.

Encrypt a file and send it to your Friend

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1. Import your friend’s public key

When you want to send a secret file to your friend, the first thing to do is to import your friend’s public key. You can import your friends public key from a “Key server” if he/she has exported their public key to a key server.

Refer to the “Export Your Public Keys” section in our GnuPG Basics article to understand how to export your public key to a key server.

To import public key from a key server, do the following. You can import by using any one of the above methods. Provide your friend’s Key-ID or E-Mail ID or Real Name to import the keys correctly.

  • Public key authentication solves this problem. You generate a key pair, consisting of a public key (which everybody is allowed to know) and a private key (which you keep secret and do not give to anybody). The private key is able to generate signatures.
  • Overview Public key authentication is a way of logging into an SSH/SFTP account using a cryptographic key rather than a password. If you use very strong SSH/SFTP passwords, your accounts are already safe from brute force attacks. However, using public key authentication provides many benefits when working with multiple developers. For example, with SSH keys you can allow multiple developers to.

To import public key from a file, do the following. If your friend has E-Mailed you his/her public key, then you can import those keys by using the following command

2. Verify the imported key server

You can verify whether you have successfully imported your friend’s public key using –list-keys option

Now I’ve my friend Raman’s public key imported.

3. Encryp a secret file using your friend’s public key

Now that you have the public key of your friend, you can send him a file, which is encrypted using “Your Friend’s Public Key”, so only your friend ( Who is having the private key ), can decrypt it.

Note that there is a warning, which says, there is no guarantee that the “Public Key” belongs to your friend. We will look back at this when time permits. As of now, since I trust my fried, I’ve given “Yes” to use the key.

It will create a file named “a.txt.pgp”, when opened using editor, it will have some binary data. Send this file to your friend by any means.

If you don’t want to send a binary content, or there are issues in sending binary, you can use the –armor option which creates an ASCII file as shown below.

Decrypt a file

Now your friend would have received your encrypted file. In order to view the content of the file, he need to decrypt the file. Since decrypt operation will be performed by using your friend’s private key, it will ask for the passphrase provided by your friend while creating keys.

Now the file secret.txt will contain the actual text written.

Send an encrypted file to multiple recipient

Generate Key File Public Key File From Mac Secret Number

You can also send a file to multiple recipients by using the –recipient or -r

Once the above command is given, gpg will use the public key of all the recipients to encrypt the data in such a way that any one of their private keys can decrypt the data.

In our next article in this series, we will explain how to sign the message with data and timestamp on it.

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