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About Encryption
1- Secure exchanges with OpenPGP
Click here to download my OpenPGP public key (text file) 
You can then check its fingerprint, that should be: 5D7E 0A8A CAA1 8970 4916 614E 34E1 F64A 4795 2B4C
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
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(eg. sign someone's public key with my private key)
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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- Keys usage: 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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(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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(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- Keys usage: check and uncrypt
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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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(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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(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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2- Secure communication with SSH/DSA
... Under writing ...
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