Growth curves are found their applications in a wide range of scientific fields, such as biology, chemistry, physics, psychology and medical science. Computer worms began to use flaws using Internet mediation. There many global Internet worms such as Code Red, Witty, Nyxem, Blaster, Welchia, Slammer/Sapphire, Conficker, MyDoom, Nimda, Storm, Netsky epidemics which we tried to cover in present book using many different sources. The damage from these threats often is more than billions of dollars for a year. Our motivation to write this book is that we found a flaws in many published papers in this scientific area. These flaws in research of dynamics of worms propagation are pointed out by many serious specialists in this area.