Plain fence: Good old wire/bolt cutters. Man sized hole in about 20-30
seconds. Or just climb it. If stealth is required, climbing may not be the
best option. Finding a tree near the fence is a common and preferred tactic
(which is why I recommend that NO trees be within 25 feet of the perimeter).
Some fences have sensors in them. The tree method will defeat that, since
you never have to touch the fence. Ladders can also be used to defeat
shock/vibration sensors, but then again, you defeat the stealth advantage
when leaving a 15 foot ladder nearby.

Barbed wire: See above. If it is the farmer's variety, it is usually at
the top. You can cut it, but it is easy to climb over without injury. Razor
spiral, on the other hand is not. Plus cutting razor spiral may leave you
looking like Michael Jackson during surgery. But why bother with that when
you can just go through the fence. If there is also a perimeter of razor
spiral near the ground, one tactic is to take a large board, place it over
the obstacle and go over it.

Electrical: Tougher. Gotta go over or under. They are usually buried nice
and deep, so over is preferred.

One thing we forgot was seismic sensors, vibration sensors, electric field
sensors, fence shock sensors, etc. Even if you jump over, you will more
than likely set these off. Same with digging. A combo of the two (Sensor
(IDS) and active fence like razor ribbon or electric (firewall) is an
excellent perimeter defense.

Regards,

Brian Taylor
Senior Security Analyst
SecureWorks Inc.

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