Jul 12, 2019 To share your key as a file, we need to export it from the gpg local key store. To do this, we’ll use the -export option, which must be followed by the email address that you used to generate the key. The -output option must be followed by the name fo the file you wish to have the key exported into. The -armor option tells gpg to generate ASCII armor output instead of a binary file. Gpg -output /dave-geek.key -armor -export dave-geek@protonmail.com.

• Generate Public Key Pair Linux
• Generate Gpg Key Pair Linux Windows 10
• Create Gpg Key Pair Linux

Table of Contents

Generating a new keypair

Exchanging keys

Encrypting and decrypting documents

Making and verifying signatures

You can generate an SSH key pair directly in cPanel, or you can generate the keys yourself and just upload the public one in cPanel to use with your hosting account. When generating SSH keys yourself under Linux, you can use the ssh-keygen command. To do so follow these steps: Open up the Terminal. In order to use GPG encryptions, you will have to install a software that helps generate and manage your GPG encryptions and keys On Linux systems, a popular tool to help with GPG is GnuPG GnuPG is a free software implementation of the OpenPGP standard that allows you to encrypt and sign your data and communications using GPG encryptions.

GnuPG is a tool for secure communication.This chapter is a quick-start guide that covers the core functionalityof GnuPG.This includes keypair creation, exchanging and verifying keys, encryptingand decrypting documents, and authenticating documents with digitalsignatures.It does not explain in detail the concepts behind public-key cryptography,encryption, and digital signatures.This is covered in Chapter 2.It also does not explain how to use GnuPG wisely.This is covered in Chapters 3 and 4.

GnuPG uses public-key cryptography so that users may communicate securely.In a public-key system, each user has a pair of keys consisting ofa private key and a public key.A user's private key is kept secret; it need never be revealed.The public key may be given to anyone with whom the user wants tocommunicate.GnuPG uses a somewhat more sophisticated scheme in which a user hasa primary keypair and then zero or more additional subordinate keypairs.The primary and subordinate keypairs are bundled to facilitate keymanagement and the bundle can often be considered simply as one keypair.

The command-line option --gen-keyis used to create a new primary keypair.GnuPG is able to create several different types of keypairs, but a primarykey must be capable of making signatures.There are therefore only three options.Option 1 actually creates two keypairs.A DSA keypair is the primary keypair usable only for making signatures.An ElGamal subordinate keypair is also created for encryption. Option 2 is similar but creates only a DSA keypair.Option 4[1] creates a single ElGamal keypair usable for both making signatures and performing encryption.In all cases it is possible to later add additional subkeys for encryptionand signing.For most users the default option is fine.

You must also choose a key size.The size of a DSA key must be between 512 and 1024 bits, and an ElGamalkey may be of any size.GnuPG, however, requires that keys be no smaller than 768 bits.Therefore, if Option 1 was chosen and you choose a keysize larger than1024 bits, the ElGamal key will have the requested size, but the DSAkey will be 1024 bits.The longer the key the more secure it is against brute-force attacks,but for almost all purposes the default keysize is adequate sinceit would be cheaper to circumvent the encryption than try to break it.Also, encryption and decryption will be slower as thekey size is increased, and a larger keysize may affect signature length.Once selected, the keysize can never be changed.

Finally, you must choose an expiration date.If Option 1 was chosen, the expiration date will be used for both theElGamal and DSA keypairs.For most users a key that does not expire is adequate.The expiration time should be chosen with care, however,since although it is possible to change the expiration date after the keyis created, it may be difficult to communicate a changeto users who have your public key.

You must provide a user ID in addition to the key parameters.The user ID is used to associate the key being created with a realperson.Only one user ID is created when a key is created, but it is possibleto create additional user IDs if you want to use the key in two ormore contexts, e.g., as an employee at work and a political activiston the side.A user ID should be created carefully since it cannot be edited afterit is created.

GnuPG needs a passphrase to protect the primary and subordinate private keys that you keep in your possession.There is no limit on the length of a passphrase, and it should becarefully chosen.From the perspective of security, the passphrase to unlock the privatekey is one of the weakest points in GnuPG (and other public-key encryption systems as well) since it is the only protection you have if another individual gets your private key.Ideally, the passphrase should not use words from a dictionary andshould mix the case of alphabetic characters as well as use non-alphabetic characters.A good passphrase is crucial to the secure use of GnuPG.

Generating a revocation certificate

After your keypair is created you should immediately generate a revocationcertificate for the primary public key using the option--gen-revoke.If you forget your passphrase or if your private key is compromised or lost, this revocation certificate may be published to notify othersthat the public key should no longer be used.A revoked public key can still be used to verify signatures madeby you in the past, but it cannot be used to encrypt future messagesto you.It also does not affect your ability to decrypt messages sent toyou in the past if you still do have access to the private key.The argument mykey must be a keyspecifier,either the key ID of your primary keypair or any part of a user IDthat identifies your keypair.The generated certificate will be left in the filerevoke.asc.If the --output option is omitted, the result will be placed on standard output.Since the certificate is short, you may wish to print a hardcopy ofthe certificate to store somewhere safe such as your safe deposit box.The certificate should not be stored where others can access it sinceanybody can publish the revocation certificate and render thecorresponding public key useless.

Notes

[1]

Option 3 is to generate an ElGamal keypair that isnot usable for making signatures.

GPG basic file encryption doesn’t required public/private key. But to make a encrypted file more secure you can use RSA/DSA algorithms. These algorithms generates public and private keys to encrypt file.

This article will help you to do following three tasks for File Encryption using GPG Key Pair in Linux.

• Create key pair
• Encrypt/Decrypt file locally for same user account.
• Encrypt file for other user.
• Decrypt other users file.

Step 1: Create GPG Key Pair

The very first step is to generate key pair. Use the following command to generate gpg key pair.

Output:

Step 2: Encrypt/Decrypt File Current User

Encrypt file for single user only. No one other can decrypt this file.

–recipient name should be same as used in key generation. Above command will automatically generate a encrypted file named tecadmin.txt.gpg

Decrypt your own file tecadmin.txt.gpg

–output or -o is used to specify output file name. Above command will prompt for passphrase used in key pair.

Step 3: Encrypt File for Other User

Use #1 steps to generate encrypted file. Finally share your public key and encrypted file ( tecadmin.txt.gpg ) with other users. To export your public key use following command.

Check your public key. It should be like below

Step 4: Decrypt Other Users File.

To decrypt other users file, It required public key of that user. Import that public key to your account using below command. Nikon capture nx2 product key generator. For example other users public file is otherpub.txt

Make sure that file has been imported successfully using below command.

Above command will show all public key in your account. Make sure the other users public key also exist there.

Generate Public Key Pair Linux

Generate Gpg Key Pair Linux Windows 10

Now you can decrypt the other users file using below command

Create Gpg Key Pair Linux

Thank You for reading this article. Read our next article to File Encryption using GPG Command Line.