This question text is too difficult, it's hard to understand.

He encrypted the message using a public key.

You must never show this secret key to anyone else.

Let's exchange keys tomorrow.

There is an old boiler in this house.

The safety of nuclear reactors is very important.

In this factory, they are melting iron using an electric arc furnace.

This nuclear power plant is scheduled to be decommissioned next year.

The government announced a plan to decommission the old nuclear power plant.

He is good at playing the black keys.