When you generate your key pair, both of them should have been automatically added to it. When dealing with asymmetrical keys and files, you have to add the keys to your keyring. Likewise, you should share your public key with them, so that they can send encrypted files to you. You should generate your own key pair, and share your public key with whom else might want to send you something. You do not want to share your private key, and nobody should be sending you their private key. If you read the bits I posted before and watched the video, you should know that there are two files used with asymmetrical encryption. If you were given a key file together with the file, you might decrypt it with something like: gpg -batch -passphrase-file PASS.key -output FILE -decrypt FILE.gpgĭecrypting a file that uses asymmetrical encryption In this case, the key is still a passphrase/password, just one that you don't need to type. Sometimes, instead of remembering passwords, people might choose to symmetrically encrypt a file with a key instead. Once issued, you will be requested for a passphrase, and if correct, you will have a new FILE, on the same folder, which is the decrypted version of that file. Usually, all that is required is a simple gpg FILE.gpg. Decrypting a file encrypted with symmetrical encryption GPG and PGP are both implementations of the same thing, a standard called OpenPGP, so usually both can handle files encrypted with either one. When dealing with OpenPGP encryption on Linux the program used is usually GNU Privacy Guard, or GnuPG, invoked with the command gpg. Since there are two ways of encrypting a file, there are also two ways of decrypting a file. And then only the recipient, with his private key can decrypt the file. Usually, the key to encrypt the file is public, and the file is encrypted with one recipient in mind, because it is the recipient's public key that will be used to encrypt the file. One to encrypt a file a different one to decrypt it. The same passphrase is required to decrypt the file.Īsymmetrical encryption uses two different keys. The key is usually a passphrase that you chose when you encrypted the file. Symmetrical encryption uses the same key to both encrypt and decrypt a file. There are two forms of encryption, symmetrical and asymmetrical.
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