Then you run the risk (as it just happened) of having the program losing efficacy if knowledge about it is leaked. Compared to a hypothetical program where know

Then you run the risk (as it just happened) of having the program losing efficacy if knowledge about it is leaked. Compared to a hypothetical program where knowing of its existence doesn't weaken it. Whether such a system can be built is debatable (something like the universal eavesdropping in 1984), but not a priori impossible.