In a fit of desperation when I had my wireless connection die on me, I thought it was a problem with the key I had created at the start when I initially configured the wireless connection and hence deleted it. The option to create the key had presented itself when I created the wireless connection. It no longer asks me to.

Now I am back online, do I have re-create the password and key I had before? If so, what do I choose and why? The options I have are as follows;

1. PGP
2. Stored password
3. Password keyring
4. Secure shell key

The first and last option seem to be obvious and I have no idea about the differences between the second and third options.

Why do I need a stored password or password keyring in all scenarios and not just the wireless issue I ran into?

EDIT 0

Further to Belisama's comment, I have amended my question.

EDIT 1

As requested, I have attached a screenshot