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White BoxA white box, in contrast to a black box, is a subsystem whose internals are visible to view, but usually cannot be altered. This is useful during white box testing, where a system is examined to make sure that it fulfillls its requirements. Having access to the subsystem internals in general makes the subsystem easier to understand, but also easier to hack; if a programmer, for example, can examine source code, weaknesses in an algorithm are much easier to discover. This makes white box testing much more effective than black box testing, but considerably more difficult due to the sophistication needed on the part of the tester to understand the subsystem. Also known as glass box, clear box, or open box.
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