How to become an
ethical hacker

Ethical hacking — usually called penetration testing — means simulating real attacks with permission to find and prove weaknesses. The work includes agreeing scope and rules of engagement, reconnaissance and attack surface mapping, testing web applications and APIs, testing networks and internal environments, understanding exploitation and privilege escalation, testing cloud and mobile apps, avoiding harm to production systems, documenting evidence and writing reports that translate technical findings into business risk and fixes. Related paths include bug bounty hunting and red teaming.

Attackers increasingly exploit vulnerabilities directly: Verizon's 2026 Data Breach Investigations Report found 31% of breaches start that way.¹ Testers use MITRE ATT&CK to describe techniques² and the OWASP Top 10 to frame web risks.³ Severity is often expressed with FIRST's CVSS, adjusted for context.⁴ In India, AmbitionBox lists penetration testers at a typical ₹9.8–10.8 lakh.⁵

Breaches starting with exploited vulnerabilities (Verizon DBIR 2026)

31%

Typical penetration tester pay in India (AmbitionBox)

₹9.8–10.8 lakh

Penetration tester salaries reported in India (AmbitionBox)

1,300+

Tests allowed without written authorisation

0

Table: How penetration testers are assessed (editorial summary)

Table: A clear penetration test finding (illustrative)

Table: How ethical hacking developed (editorial summary)

• Lab or CTF write-ups with methodology
• A sample report with business impact
• Web and network testing practice
• Understanding of scope and rules of engagement
• Responsible disclosure experience, if any
• A verified ethical hacking certificate

Show method and communication: "Completed 40+ lab machines with documented methodology; wrote sample pentest reports; two valid bug bounty reports in authorised programmes."

"How would you test a login form?"

Rate limiting, enumeration, credential stuffing protections, MFA logic, session handling and password reset flows — within scope.

"What do you do if you find something critical mid-test?"

Stop, document and notify the client contact immediately per the rules of engagement.

"How do you avoid damaging systems?"

Agreed windows, non-destructive techniques, test accounts and care with automated tools.

"Explain an IDOR to a CEO."

Customers can see other customers' data by changing a number in a link.

"What makes a good report?"

Clear summary, prioritised findings, evidence, business impact and practical fixes.

• "What types of engagements?" — web, network, cloud, red team.
• "How is scope agreed?" — professionalism.
• "What does report QA look like?" — quality.
• "Is there time for research and training?" — growth.

Table: Offensive security roles and typical pay in India (AmbitionBox, October 2026; indicative)

Table: Common ethical hacking tools (editorial guidance)

• IT or SOC role — foundations.
• Junior penetration tester — supervised testing.
• Penetration tester — independent engagements.
• Senior tester / red teamer — complex attacks.
• Offensive security lead — team and methodology.

1. Week 1: Foundations — Networking and Linux.
2. Week 2: Web — HTTP, sessions, OWASP Top 10.
3. Week 3: Labs — Practise on intentionally vulnerable machines.
4. Week 4: Networks — Services and privilege escalation in labs.
5. Week 5: Reports — Write two findings properly.
6. Week 6: Prove it — Take the Ethical Hacking Fundamentals Certification.

Related: Application Security, Vulnerability Management and Linux Fundamentals. Guides: application security, vulnerability management and Linux.

• Scoping calls — agreeing rules.
• Testing — methodical, documented.
• Communicating — critical findings immediately.
• Reporting — the main deliverable.
• Retesting — confirming fixes.
• Learning — new techniques constantly.

"Black-box vs white-box testing?"

Black-box testers have no internal knowledge; white-box testers get code and documentation — usually finding more.

"What's privilege escalation?"

Gaining higher access than initially obtained, such as user to administrator.

Table: A first-90-days plan (editorial guidance)

Learn the firm's methodology and report standards before anything else. Shadow senior testers, then take on supervised portions of engagements. Focus on report quality — it's what clients remember.

AI assistants help testers write scripts, analyse code and summarise findings, and some tools automate reconnaissance and parts of testing. Attackers use similar tools, which raises the bar for defences. Testers increasingly assess AI systems themselves — prompt injection, data leakage and unsafe agent actions. Human creativity and judgement remain central, especially for business-logic flaws like price manipulation that automated tools miss. Always confirm AI-suggested findings manually before reporting.

Use platforms and machines built for training: intentionally vulnerable web apps, capture-the-flag events and lab environments run by training providers. Build your own lab with virtual machines. Join bug bounty programmes only within their published scope and rules. Keep notes and write-ups of everything you do; they form your portfolio. Never scan or attack systems you don't own or have written permission to test — not your college network, not your employer's systems, not a website you're curious about.

Lead with a clear title and one-sentence impact a non-technical reader understands. Provide reproducible steps and evidence, rate severity in context, and give a specific fix with references. Keep the tone neutral and helpful. Group related issues and highlight root causes. Developers fix findings faster when they can reproduce them easily and see exactly what to change.

"It's about tools." Methodology, curiosity and communication matter more.

"Hacking skills alone get hired." Reports and professionalism decide repeat business.

"Any testing is fine if intentions are good." Without authorisation, it's illegal.

Most professional engagements follow a similar shape. It starts with scoping: agreeing which systems, applications and IP ranges are in scope, which techniques are allowed, testing windows and emergency contacts. A signed authorisation document protects both the client and the tester. Next comes reconnaissance — mapping the attack surface through public information, DNS, exposed services and application functionality — always within the agreed scope.

Testing follows a methodology rather than random poking. For web applications, testers examine authentication, session management, access control, input handling, business logic and configuration. For networks, they identify services, check for known vulnerabilities, misconfigurations and weak credentials, and, where allowed, attempt to move laterally or escalate privileges. Throughout, they take careful notes and capture evidence such as requests, responses and screenshots.

Exploitation is used to confirm impact, not to cause damage. Testers prove a vulnerability with the least intrusive method possible and stop when impact is demonstrated. Critical findings are reported immediately rather than waiting for the final report.

The engagement ends with a report and often a debrief. Good reports open with an executive summary in business language, then detail each finding with severity, evidence, impact and remediation. Many clients ask for retesting after fixes, which closes the loop. Understanding this structure — and being able to explain it clearly in interviews — signals professionalism as much as technical skill.

• Testing without permission.
• Relying only on scanners.
• Weak fundamentals.
• Poor reports.
• Causing damage.

Breach patterns come from Verizon's 2026 DBIR; attacker techniques from MITRE ATT&CK; web risks from OWASP; severity scoring from FIRST's CVSS; and India pay from AmbitionBox (read October 2026). The finding example, practice guidance and history are editorial. Science of Apps publishes the free test linked here. Last reviewed October 2026.

• Penetration test — an authorised simulated attack.
• Rules of engagement — agreed scope, timing and limits.
• Reconnaissance — gathering information about targets.
• Privilege escalation — gaining higher access.
• Bug bounty — rewards for vulnerability reports.