It says on their mission statement that they do SIGINT and information assurance (i.e. IT security) and there is plenty of public evidence that they do both. Pl

It says on their mission statement that they do SIGINT and information assurance (i.e. IT security) and there is plenty of public evidence that they do both. Plus they've been deeply involved with designing cryptographic protocols and equipment for the US govt for a very long time which is part of SIGINT but it's not the offensive part. https://www.nsa.gov/about/mission-values/ https://www.nsa.gov/about/mission-values/