Cyber security is the practice of protecting computers, networks, applications and data from unauthorised access, attack and damage, and of detecting and recovering from incidents when they happen.
What cyber security actually protects
Security work is usually framed around three goals, known as the CIA triad. Confidentiality means only the right people can see the data. Integrity means nobody can quietly change it. Availability means systems are there when people need them.
A hospital, a bank and an online shop weigh those three differently, which is why security is as much about judgement as about tools.
The attacks defenders deal with most
- Phishing and social engineering: tricking people into giving up passwords or approving payments.
- Ransomware: encrypting an organisation's data and demanding payment to release it.
- Malware: software built to steal, spy or damage.
- Web application attacks: exploiting flaws such as SQL injection to reach data behind a website.
- Denial of service: flooding a service until real users cannot reach it.
- Insider threats: damage done, on purpose or by accident, by people with legitimate access.
Career roles in cyber security
SOC analyst
Watches alerts in a security operations centre, investigates them and escalates real incidents. A common first job.
Penetration tester
Attacks systems with permission, then reports how the weaknesses can be fixed.
Security engineer
Builds and runs the defences: firewalls, identity systems, monitoring and secure cloud setups.
Incident responder and forensic analyst
Contains a breach, works out what happened and preserves the evidence.
Application security engineer
Works with developers so that software ships without avoidable flaws.
Governance, risk and compliance
Turns laws, standards and business risk into policies people can follow.
What you need to learn
- FoundationsNetworking, operating systems (especially Linux) and how the web works.
- ScriptingPython and shell, to automate checks and read logs.
- OffenceEthical hacking, penetration testing and how common attacks work.
- DefenceMonitoring, SIEM tools such as IBM QRadar, incident response and digital forensics.
- Applied areasApplication, database, cloud and IoT security, and applied cryptography.
- AI in securityUsing machine learning to spot anomalies, and defending AI systems themselves.
Is cyber security right for you?
It suits people who enjoy working out how things break, who stay calm when something goes wrong, and who accept that the subject keeps changing. Ethics matter too: testing systems is only legal with permission, and the work often gives you access to sensitive data.
You do not need to be a programmer on day one, but you do need comfort with technology and a willingness to learn by practising in a lab.
Learn this at Aegis
Aegis runs a Post Graduate Program in Cyber Security in association with IBM, covering ethical hacking, digital forensics, application security and related areas.
Frequently asked questions
What is cyber security in simple words?
It is the work of protecting computers, networks and data from people who want to steal, change or disrupt them, and of recovering when an attack gets through.
What qualifications do I need to work in cyber security?
Employers usually look for a graduate degree, a sound grasp of networking and operating systems, and hands-on practice. A post graduate program or recognised certifications can help you show that practice.
Do I need to know coding for cyber security?
Not for every role. Governance roles need little, while penetration testing and security engineering benefit from scripting. Python is a sensible first language.
What is the first job in cyber security?
Security operations centre (SOC) analyst is a common starting point, because it teaches how real alerts and incidents look. Junior penetration testing and IT security roles are other routes.
How much do cyber security professionals earn in India?
Pay depends on city, employer, role and experience, so check current job listings for the role you want. Ask the Aegis admissions team for placement details for the program.