gpg --full-generate-key
# default
# 4096 size
# 0 (do not expire)
# real name : your-name
# email : your@mail.com
gpg --list-secret-keys --keyid-format=long
# Encrypt
gpg --encrypt --sign --armor -r person@mail.com name_of_file
# Decrypt
gpg file_name.asc