!!! Overview
[{$pagename}]  a particular security [vulnerability] that breaks not just one system, but an entire class of systems.[1]

!! [{$pagename}] [example]
Picking a mechanical door lock requires both skill and time. Each lock is a new job, and success at one lock doesn't guarantee success with another of the same design. 

Electronic door locks, like the ones you now find in hotel rooms, have different vulnerabilities. An attacker can find a flaw in the design that allows him to create a key card that opens every door. 

If he publishes his attack software, not just the [attacker], but anyone can now open every lock. And if those locks are connected to the [Internet], attackers could potentially open door locks remotely -- ­they could open every door lock remotely at the same time. That is an [Example] of a [{$pagename}].

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Class Breaks|https://www.schneier.com/blog/archives/2017/01/class_breaks.html|target='_blank'] - based on information obtained 2017-01-03