About Encryption
1- Secure exchanges with OpenPGP
You can find my public key to encrypt files or mails before sending to me: on the Contact page.
If you don't understand why you should encrypt most of your administrative and professional messages, please refer to this link.
This paragraph is a summary of GnuPG commands, for convenient use. I mainly relied on this document to write it.
You may publish your public key on your website, in your email signature, or on this or thatserver.
a- Keys management
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Generate a pair of keys
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gpg --gen-key
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Generate a revocation certificate
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gpg --gen-revoke
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Edit the keys
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gpg --edit-key key-id (eg: 5E3EB81D)
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(eg. sign someone's public key with my private key)
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Add another User ID
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adduid
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Switch primary User ID
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[n], then primary
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Export public keys
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gpg --export -a
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Export private keys
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gpg --export-secret-keys -a
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Import keys
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gpg --import
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Display keys fingerprint
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gpg --fingerprint
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Erase a public key
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gpg --delete-key
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Erase a private key
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gpg --delete-secret-key
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List public keys
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gpg --list-keys
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List private keys
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gpg --list-secret-keys
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List signatures
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gpg --list-sigs
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b- Crypt and Sign
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Produce a crypted message file
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gpg --encrypt -a your_message.txt > crypted_message.txt
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(use the public key of the recipient, this insures that your message won't be read by someone else)
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Produce a signature attachment file
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gpg --detach-sign -a your_message.txt > signature.txt
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(use your private key and the crypted message content, this insures that your message is sent by you)
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Produce a single compressed file including both
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gpg -u exp -r dest -a --sign --encrypt your_message.txt > signed_message.txt
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c- Check and Decrypt
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Check a signature attachment file
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gpg --verify their_signature.txt their_message.txt
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(use the public key of the sender and the crypted message content, this insures that your message has been sent by the signee)
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Decrypt a crypted message file
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gpg --decrypt their_message.txt > message.txt
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(use your private key, this insures that your message has not been read by someone else)
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Check and decrypt at once a single compressed file
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gpg --decrypt their_message.txt > message.txt
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d- Symmetrically Encrypt/Decrypt
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Encrypt a document
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gpg --encrypt --symmetric -a your_document.txt > crypted_document.txt
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Decrypt a document
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gpg --decrypt --symmetric your_document.txt > document.txt
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(use your private key for encrypt and decrypt, this insures that a document has been encrypted by you and can be decrypted only by you)
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