Hacking a network, using an ‘invisibility cloak’ – Is it that simple?

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Security experts describe a real attack case that sees the attackers using a small, unidentified hardware device to hack into the target network.

Is it possible to hack into a network using a sort of invisibility cloak?

The short answer is, YES it is. We came to this conclusion after analyzing an incident after an audit in a Tier-1 bank.