# From Linux Mag N.255 - article from Frederic Leroy

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# Using zip/unzip (7zip recommended by CNIL)
# encrypt
zip -e archive.zip file.txt file-2.txt
# decrypt
unzip -e archive.zip

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# Using gpg2
# encrypt
gpg2 --symmetric file.txt
# decrypt
gpg2 file.gpg

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# Using openssl
# encrypt
openssl enc -aes-256-cbc -in file.txt -out file.crypted
# decrypt
openssl enc -d -aes-256-cbc -in file.crypted -out file.txt