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.
Causes of Heart Palpitations. Many things can cause heart palpitations. In the vast majority of cases, the cause is either related to your heart or is unknown. Non-heart-related causes of palpitations include: 1  Strong emotions such as anxiety, fear, or stress; palpitations often occur during panic attacks.2  Vigorous physical activity. 3  Caffeine, nicotine, alcohol, or illegal street drugs such as cocaine and amphetamines. 4  Medical conditions, including thyroid disease, a low blood sugar level, anemia, low ....n the vast majority of cases, the cause is either related to your heart or is unknown. Non-heart-related causes of palpitations include: 1  Strong emotions such as anxiety, fear, or stress; palpitations often occur during panic attacks.