There are a number of ways that a person or organization can defend against signals intelligence.

Its main purpose is to collect and map signals intelligence across the world.

Golovko could guess at signals intelligence, but he'd never quite know.

The information on overseas threats came mainly from signals intelligence.

It is also an important US base for signals intelligence and related activities.

We're to observe and conduct signals intelligence for the moment, but no more.

The pirates who were the main threat to Strymon apparently didn't concern themselves with signals intelligence.

Some of America's greatest wartime victories were the result of signals intelligence.

The signals intelligence allowed an accurate assessment of whether the double agents were really trusted by the Germans and what effect their information had.

An order to launch would come through the phone, a landline that could not be intercepted by Pakistan's signals intelligence.