Nikita, Season 1

Percy:
What we do know is that she's been ahead of us at each step. At a certain point we have to consider the possibility of a leak from the inside...a high level leak.

Michael:
I'd like to rule out a data breach before we start the mole hunt.

Birkhoff:
Whoa, whoa, whoa, whoa, whoa, whoa. Data breach? No way. No. Our network is Fort Knox. Internal servers are air-gapped and I run routine PAN tests on the outer defenses. We're talking five-tier security with protocols that rotate every hour, on the hour. That's proprietary software. Only person who could dream of hacking into Division is me. [The two men stare at Birkhoff] What?