Cyber Security – Complete Notes for IBPS, SSC, RRB & Govt Exams

Introduction: Why Cyber Security is Critical for Banking Exams

India's banking sector processes over 9.41 billion UPI transactions per month (2024). Every one of these transactions is a potential target for cybercriminals. Banks are the most targeted sector for cyber attacks — making Cyber Security knowledge essential not just for passing the exam, but for performing effectively on the job.

In government job exams, Cyber Security is tested across multiple difficulty levels:

• "VIRUS stands for ___?" → Vital Information Resources Under Siege
• "Which malware encrypts your files and demands ransom?" → Ransomware
• "The first computer virus was ___?" → Creeper (1971)
• "WannaCry is an example of ___?" → Ransomware
• "Which attack floods a server with requests?" → DDoS (Distributed Denial of Service)
• "IT Act was enacted in which year?" → 2000
• "CERT-In stands for ___?" → Computer Emergency Response Team India

This chapter is also where banking awareness meets computer awareness — phishing attacks on banking customers, ATM skimming, UPI fraud, and data breach notifications are everyday banking news items. Mastering Cyber Security makes you a better-prepared exam candidate AND a more effective banking professional.

What is Cyber Security?

Cyber Security (also called Computer Security or IT Security) is the practice of protecting computer systems, networks, programs, and data from unauthorised access, damage, attack, or theft.

Scope of Cyber Security:

• Protecting hardware (servers, computers, mobile devices) from physical tampering
• Protecting software (operating systems, applications) from malware and exploits
• Protecting data (stored data, data in transit) from theft and corruption
• Protecting networks from intrusion and interception
• Protecting users from social engineering and fraud

Why Cyber Security matters in banking:

• Customer financial data is extremely sensitive
• A single data breach can expose millions of accounts
• Regulatory requirements (RBI, SEBI, IRDAI) mandate strong security
• Trust is the foundation of banking — one attack can destroy years of reputation

Components (Goals) of Security

Security is not just about preventing unauthorised access — it has multiple dimensions:

Cryptography - The Science of Secure Communication

Cryptography is the science of writing and reading messages in secret form — converting data into an unreadable format that can only be decoded by authorised parties.

Steganography vs Cryptography:

• Steganography — hides the existence of a message (the message is there, you just can't see it)
• Cryptography — hides the content of a message (the message is visible, but unreadable)

Key Cryptography Terms

Types of Encryption

How HTTPS Works (Asymmetric + Symmetric):

1. Website sends its Public Key (in SSL certificate) to your browser
2. Browser encrypts a random session key using the website's Public Key
3. Website decrypts it using its Private Key
4. Both now share a secret session key
5. All further communication uses Symmetric Encryption (faster) with that session key

Types of Malware - Complete Guide

Malware (Malicious Software) is any software intentionally designed to disrupt, damage, or gain unauthorised access to a computer system.

Computer Virus

VIRUS = Vital Information Resources Under Siege

A computer virus is a self-replicating malicious program that attaches itself to legitimate files or programs and spreads when infected files are executed.

Key Virus Facts:

• First computer virus: Creeper (1971) — displayed "I'm the Creeper, catch me if you can!" and replicated across ARPANET
• First PC boot sector virus: Brain (1986) — created in Pakistan by the Alvi brothers
• Viruses require human action to spread (running an infected file, opening an attachment)
• They attach to host files — unlike worms which are standalone

Types of Viruses

Worm

Trojan Horse

Spyware

Adware

Ransomware

Rootkit

Logic Bomb

Keylogger

Malware Types - Quick Comparison Table

Types of Cyber Attacks

Security Solutions - Complete Guide

Antivirus Software

Firewall

Password Security

Digital Certificate

Digital Signature

VPN (Virtual Private Network)

MFA / 2FA (Multi-Factor Authentication)

Biometric Authentication

CAPTCHA

End-to-End Encryption (E2EE)

Zero Trust Security

File Access Permissions

In operating systems, files and folders have three basic permission types that control what users can do with them:

Permissions can be set for three categories of users:

• Owner — the user who created the file
• Group — users belonging to the file's group
• Others — all other users

Other Security Terms

Cyber Laws in India

Key IT Act Sections:

Memory Tricks

🔑 First Virus and First PC Virus:

First virus: Creeper (1971) — "Creeper Came first in '71" First PC boot sector virus: Brain (1986) — "Brain was Boot sector in '86"

🔑 Virus vs Worm vs Trojan:

Virus = Virus Victs files (attaches + needs human action) Worm = Worm Wriggles through network (self-spreading, no host) Trojan = Trojan is Trickery (disguised, does NOT replicate)

🔑 Security Components — "CIA + NPA":

Confidentiality | Integrity | Availability (the CIA Triad — core of security) Plus: Non-repudiation | Privacy | Authentication

🔑 Types of Attacks — "HPSS DM":

Hacking | Phishing | Spoofing | Salami | DDoS | Man-in-the-Middle

🔑 Authentication Factors — "KHA":

Something you Know (password) Something you Have (OTP, token) Something you Are (biometric)

🔑 CAPTCHA Full Form:

Completely Automated Public Turing test to tell Computers and Humans Apart Remember: "CAPTCHA = Computer vs Human Automated Test"

🔑 WannaCry = 2017 = 150 countries = 200,000 computers:

"WannaCry made the world wanna cry in 2017"

🔑 IT Act 2000 + DPDP 2023:

IT Act 2000 = India's first cyber law DPDP 2023 = India's first data protection law "2000 for Cyber; 2023 for Data"

One-Liner Recap (Quick Revision)

1. Cyber Security is the practice of protecting computer systems, networks, programs, and data from unauthorised access, damage, attack, or theft — a critical concern for the banking sector.
2. The CIA Triad — Confidentiality (only authorised access), Integrity (data not altered without detection), and Availability (systems operational when needed) — forms the core of security.
3. Cryptography is the science of secure communication — Encryption converts plain text to cipher text; Decryption reverses it; Symmetric encryption uses one key; Asymmetric uses a key pair.
4. VIRUS stands for Vital Information Resources Under Siege — viruses are self-replicating malware that attach to host files and spread through human action (opening infected files).
5. The world's first computer virus was Creeper (1971), and the first PC boot sector virus was Brain (1986) — created in Pakistan.
6. A Worm self-replicates and spreads across networks automatically without human action and without needing a host file — unlike viruses that require human action to spread.
7. A Trojan Horse appears to be legitimate useful software but contains malicious code — it does NOT self-replicate and must be installed by the user.
8. Ransomware encrypts the victim's files and demands ransom payment (usually cryptocurrency) for the decryption key — WannaCry (2017) infected 200,000+ computers in 150 countries.
9. Phishing is a cyber attack that fraudulently obtains passwords and sensitive information by impersonating a trusted entity through fake emails or websites.
10. A DDoS (Distributed Denial of Service) attack floods a server with millions of requests from many compromised computers simultaneously, making it unavailable to legitimate users.
11. A Firewall filters incoming and outgoing network traffic based on security rules — it acts as a barrier between trusted internal networks and untrusted external networks.
12. Multi-Factor Authentication (MFA) requires two or more different factors (something you know + something you have + something you are) to verify identity before granting access.
13. A Digital Signature authenticates the sender, ensures message integrity, and provides non-repudiation — it is legally valid in India under the IT Act 2000.
14. Zero Trust Security operates on the principle "Never trust, always verify" — no user or device is automatically trusted, even within the corporate network perimeter.
15. The IT Act 2000 (amended 2008) is India's primary cyber law; the Digital Personal Data Protection (DPDP) Act 2023 is India's first comprehensive data protection law.

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