When you want to sign a file to send, it means that your receiver and you have generated public keys that you have already exchanged. armor parameter is used for ASCI armored message, useless to send file by mail $ gpg -encrypt -armor -recipient file_pub Encrypt and signing with public key So, you will first choose the recipient by listing public keys on your keyring so that you will use a value of his uid to encrypt file. The encryption with public key means that you already have public keys of those with whom you want to communicate. Symmetric Decryption will ask for the passphrase used to encrypt the file and will put the result of the decrypted file Encrypt with public key for a particular user gpg -d prints the result on the console.the second command creates decrypted file file_sym with the result.The first command creates a decrypted file named file-content.This method will ask you to enter a passphrase which you will give to your receiver in order to decrypt the file $ gpg -c file_sym Decrypt a symmetric encryption $ gpg -output file-content file_sym.gpg gpg extension Encrypt with a symmetric key Without the parameter, it will create the decrypted file with the same of the encrypted file but without. When decrypting, if we use -output parameter, the command will redirect the result in file specified which follows the option. It will not delete the original file so be careful. So take a look by listing the content folder when terminating an encryption command. GPG Command to Encrypt and Decrypt FilesĮncryption process always creates a file with. It also helps to ensure that the message was transmitted in full, without damage or file corruption. This can prevent a third-party from "spoofing" the identity of someone. The receiver ( uses the public key of the sender to verify that the signature is actually being sent by the indicated user. The sender of a message ( can "sign" the message with his private key. $ gpg -keyserver -search-keys searching for from hkp server So each party has their own private key and the other user's public key. Establishing a secure communication means that you have already exchanged public keys with people or organization you trust in. Any private key has one public key and any public key has one private key it is always one to one mapping. The security is assured by private and public keys. Of course, this requires you to trust the public key. This does not make a message unreadable to anyone but can verify that the message really originated from the sender and was not altered since. The fingerprint can be verified against a public key. When you sign a message, then it creates a fingerprint for the message just to make sure that the content hasn't been altered, but it has no effect on the message itself and the message will never be encrypted. Message encryption makes the whole message unreadable to anyone but the owner of the corresponding private key. The principles of encrypting and signing messages It ensures data integrity, message authentication, and non-repudiation altogether. Encryption provides confidentiality although signing binds the identity of the message source to this message. Encryption will be a welcome safeguard for whenever you, your family, or business partners need to communicate sensitive information from one side of the globe to the other. Because our equipment is regularly connected to the internet and there is some communication, we need to protect the critical information we exchange. There is no absolute security on the internet or through a network.
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