Cyber-attack by means of "non-conventional" virus or worms adapted to the telecom world (SDH equipment, management networks, management systems, satellite receivers, etc.) could totally make unusable all the main networks of telecommunication of a country paralyzing the activity in critical sectors like electrical, audio-visual and the banking one at the same time (as long as this attack was planned and executed at the same time on all the networks. We present here a new vision in the existing threads regarding critical telecommunication infrastructures and Homeland Security.

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