One of the measures of the strength of an encryption system is how long it would theoretically take an attacker to mount a successful brute-force attack against it. Brute-force attacks are an application of brute-force search, the general problem-solving technique of enumerating all candidates and checking each one.
Ventricular fibrillation is one type of arrhythmia that can be deadly. It occurs when the heart beats with rapid, erratic electrical impulses. This causes pumping chambers in your heart (the ventricles) to quiver uselessly instead of pumping blood. Without an effective heartbeat, blood pressure plummets, cutting off blood supply to your vital organs.
The extra electrical pathway can cause two major types of rhythm disturbances: 1  Looped electrical impulses. In WPW, the heart's electrical impulses travel down either the normal or the extra pathway and up the other one, creating a complete electrical loop of signals. 2  Disorganized electrical impulses. If electrical impulses don't begin correctly in the right atrium, they may travel across the atria in a disorganized way, causing atrial fibrillation. The disorganized signals and the extra pathway of WPW also can cause the ventricles to beat faster. As a result, the ventricles don't have time to fill with blood and don't pump enough blood to the body.