TheAncientGeek comments on Fundamental Doubts - Less Wrong
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No matter how badly you're being tricked, there still must be something there to be tricked. So Cogito Ergo Sum applies without any need for further logical justification than the fact that you thought of it (whether naturally or induced by the deceiving demon, and regardless of the validity any further reasoning or justification) in the first place.
A more generalized idea might be "something exists".
So the cogito is a necessary truth? Except that it isn't, because there are arguments against it that don't depend on illusion. The Hume Buddha argument has it that thoughts don't imply thinkers.