The phrase "assured through" is correct and usable in written English.
It can be used when indicating that something is guaranteed or confirmed by means of a particular method or process.
Example: "The project's success was assured through careful planning and execution."
Alternatives: "guaranteed by" or "confirmed via".
He knew his place in history was assured through his drawings.
The B.C.S. automatic qualifier is not an issue, because the league's automatic bid is assured through 2013.
Brookfield said rental income from buildings in Lower Manhattan that were evacuated on Sept. 11 was assured through business interruption insurance.
Galekovic was busy but assured through the first half, making five saves when the Phoenix attacked on the break but Adelaide had their measure.
The renewal of the party was then assured through recruitment from youth organizations, from which the most fanatical elements, the products of a gradual selection process starting at a very early age, entered the party.
Thus social harmony cannot be assured through the recognition by the people of the virtue of their ruler, but only through strong state control and absolute obedience to authority.
Though tentative in the Parker days, he had a characteristically soft sound and coolly-timed patience of phrasing that became steadily more eloquent and assured through the 1950s and 60s, despite big changes in the musical structures around him.
For the men there was "Who Hotter Than This" and "I'm Da Man," on which Plies assured, through a mouth full of gold teeth, "Went to sleep real/ Woke up realer".
"National security cannot be assured through an outdated system.
These standards are assured through a code of conduct".
Self-starting is assured through the use of a fiber-coupled semiconductor-saturable-absorber-mirror (SESAM).
