Hello,

VirtualBox website's
instructionshttps://www.virtualbox.org/wiki/Linux_Downloadson how to
install their Linux packages provides a great 1-line key adding
command (key not stored in a file, simply piped to the standard input of
apt-key):

wget -q protocol://some.key -O- | sudo apt-key add -

The Nginx website's page http://nginx.org/en/linux_packages.html on Linux
packages provides you with the key file address:
http://nginx.org/en/linux_packages.html

To sum-up, here is a quick how-to add the Nginx key to your keyring:

wget -q http://nginx.org/en/linux_packages.html -O- | sudo apt-key add -

Have a nice day,
---
*B. R.*
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