Penetration testing course: 0x02.3 Introduction to Computer Networks






“Humans are social animals” like Aristotle said and as such they need to communicate with each other. At the beginning there was only oral (verbal) and written communication, then thanks to the evolution of electronics and telecommunication systems humans were able to communicate with each other remotely by broadcasting messages via electrical or wireless signals. We’ve seen the introduction of …






Penetration testing course: 0x02.2 Hexadecimal Numeral System






In the previous article we saw how binary numbers are represented and how to convert from decimal to binary and vice versa, finally how to perform operations like addition, substraction, multiplication, division and bitwise operations between binary numbers. In this lesson we’ll talk about the hexadecimal system and why it is important for computer science in general. DEFINITION In mathematics …






Penetration testing course: 0x02.1 Fundamentals of binary arithmetic






Any information processed by a computer is stored in binary format so it is fundamental that anyone is familiar with this numeral system. DECIMAL SYSTEM When we count we normally use the decimal system (base 10). Ten is the number which is the count of fingers and thumbs on both hands (or toes on the feet). Positional decimal systems include a …