GPG basics

# ref: http://irtfweb.ifa.hawaii.edu/~lockhart/gpg/gpg-cs.html
# Create the keypair
gpg --gen-key

# Create revocation key.
gpg --gen-revoke -armor --output=revocationCertificate.asc me@mail.address

#export keys
gpg --export -a "User Name" > public.key
gpg --export-secret-key -a "User Name" > private.key

#send pub to keyserver
gpg --keyserver keyserver.ubuntu.com --send-keys KEY-ID

# Import key from keyserver
gpg --keyserver keyserver.ubuntu.com --recv 79986AB0
gpg --list-keys

# List his fingerprint
gpg --fingerprint he@mail.address

#sign his key
gpg --sign-key he@mail.address

# list the signed key as ascii ( send it to him so that he can show to others signed by me )
gpg --export --armor he@mail.address

#encrypt plain with his (he) pub key. This will generate plain.asc which can be send only to recipients
#only those recipients can decrypt the message
gpg --encrypt --sign --armor -r he@mail.address -r arunkumarv@cdac.in plain

#encrypt files
gpg --encrypt filename #this will ask recipients. give me@address otherwise I cannot decrypt the message
gpg --encrypt --sign -r me@myaddress.com filename
gpg --output filename --decrypt filename.gpg

#decrypt files
gpg filename
gpg -d filename # just display