Here are comprehensive study notes on System Hacking — covering all 25 key concepts in depth. V visualize show_widget Part 1 — Reconnaissance (Information Gathering) 1. What is System Hacking? System hacking is the process of exploiting weaknesses in a computer system or network to gain unauthorized access, escalate privileges, steal data, or disrupt services. In ethical hacking (penetration testing), these same techniques are used legally and with permission to find and fix vulnerabilities before real attackers do. 2. Reconnaissance — Passive The attacker gathers information about the target without directly interacting with it. No packets are sent to the target, so there is no risk of detection. Techniques include OSINT (Open Source Intelligence): searching social media, LinkedIn, WHOIS lookups, DNS records, job postings, and Google dorking ( site: , filetype: , intitle: operators). 3. Reconnaissance — Active The attacker directly interacts with the target system to gathe...
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