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There are many portals in my area belonging to my faction, and I want to link them.

According to this page I must hold the portal key for the destination portal in my inventory.

How can I get the portal key for a portal belonging to my own faction?

Or, more generally, how can I link friendly portals that I don't have portal keys for?

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up vote 28 down vote accepted

You have to go there and hack the (destination) portal to obtain the key (yes, you need to hack "friendly" portals anyway to get supplies), or trade keys with team members by dropping/acquiring them.

Also, resonators "drop" keys which are used for links when one end is blown up that you can pick up.

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Does hacking a friendly portal not cause it (or me!) any damage? – agryson Nov 29 '12 at 14:11
@agryson no it does not harm the portal, even does not drain energy from it. – BanditoBunny Nov 29 '12 at 14:43
I found this highly relevant Google Document that explains all of the basics for any other beginners:… – agryson Nov 29 '12 at 21:48

The only way to link two portals is to have a portal key form the destination portal.

There are only two ways to get a portal key right now:

  • Hack a portal (actually hacking in #ingress is just a search for goodies)
  • Pick up a key lying on the ground (a key can be dropped by another player or fell out of the portal as a result of a powerful xmp blast)

Official info is here:

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