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CS-503 (C) · Cyber Security/Quick Revision Short Notes

Cyber Security (CS-503 (C)) - Unit 1 Short Notes

How unit 1 is examined

This unit defines cyber crime, its classification and challenges, then covers e-mail spoofing, spamming, internet time theft and the salami attack; introduction, classification and salami carry the marks.

Introduction of Cyber Crime

<span style="display:inline-block;padding:.16em .6em;border:1.5px solid currentColor;border-radius:999px;font-size:.68em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75">High weight</span>

Definition. <mark>Cyber crime is any unlawful act in which a computer or network is the target, the tool, or the place of the crime.</mark> A security threat is any circumstance or actor that can harm the confidentiality, integrity or availability of a system.

Diagram.

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Key points.

  1. Cyber crime uses a computer as a target (hacking, denial of service), as a tool (phishing, fraud), or as an incidental medium (storing records of a crime).
  2. Crimes against a person harm an individual directly, for example cyber stalking, harassment, defamation and e-mail spoofing.
  3. Crimes against property target money, data or software, for example hacking, virus attacks, software piracy, credit card fraud and the salami attack.
  4. Crimes against government or society threaten the state or public order, for example cyber terrorism, web jacking and the spread of illegal content.
  5. Modes of committing cyber crime include hacking, cracking, malware, phishing, denial of service, spoofing, spamming, key logging and fraud.
  6. Security threats fall into malware, phishing, denial of service, insider misuse and social engineering; a threat is the danger, a vulnerability is the weakness it exploits, and risk is the likelihood times impact of that exploitation.
  7. Cyber security is needed because banking, government and personal data now live online, and theft, fraud, malware and attacks on critical infrastructure cause large economic and national-security loss.
  8. Cyber security protects confidentiality (only authorised access), integrity (data not altered) and availability (services usable when needed): the CIA triad.

Answer frame. Open with the definition; draw the classification tree; develop points 1-4 with one example each; add modes (point 5); close with the impact on individuals, business and the nation. For "security threats" or "why cyber security" use points 6-8 with the CIA triad.

Pitfall: Do not define cyber crime only as "hacking"; state target, tool and place, and give an example per class.

Asked: [7 marks] (Dec 2020, Jun 2020, Nov 2023, Dec 2024, Jun 2025) Define the term cyber crime. Give the classification of cyber crime. List important cyber crimes and explain each in two to three sentences. What are the various modes or manner of committing cybercrime? Asked: [7 marks] (Nov 2019) What are security threats? Asked: [7 marks] (Nov 2019) Why we need cyber security explain?

Challenges of cyber crime

<span style="display:inline-block;padding:.16em .6em;border:1.5px solid currentColor;border-radius:999px;font-size:.68em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75">Medium weight</span>

Definition. Challenges of cyber crime are the technical, legal and social obstacles that make cyber crime hard to prevent, detect and prosecute. <mark>Cyber crime is borderless, anonymous and fast-changing, so law enforcement struggles to trace, prove and punish it.</mark>

Key points.

  1. Anonymity: criminals hide behind proxies, fake identities and anonymising tools, so tracing the offender is hard.
  2. Jurisdiction: the attacker, the victim and the servers may sit in different countries, so it is unclear whose law applies and extradition is slow.
  3. Scale and speed: one attack can hit millions of systems in seconds, far faster than a response can be organised.
  4. Rapid technology change: laws and investigators lag behind new tools such as encryption, cryptocurrency and cloud services.
  5. Evidence: digital evidence is volatile, easily altered or deleted, and needs specialised forensics to be admissible.
  6. Awareness and skills: users click phishing links and reuse weak passwords, and police lack trained cyber staff and reporting is low.
  7. Cyber terrorism uses computers to attack critical systems such as power grids or defence networks to spread fear; its power lies in low cost, remote action, anonymity and mass impact, and it is characterised by political motive, disruption of essential services and difficulty of attribution.

Answer frame. Open with the definition of cyber crime as an unlawful act using a computer as tool or target; then technical (1, 3, 4), legal (2, 5) and social (6) challenges in that order; for the cyber-terrorism part add point 7; close with the need for law, technology and awareness together.

Asked: [7 marks] (Nov 2019, Dec 2025) What are the various challenges of cyber crime? Define Cyber-crime. Discuss the challenges of cyber-crime in the modern digital world. Asked: [7 marks] (Nov 2022) Discuss the different issues and challenges of cybercrime? Also explain the power and characteristics of cyber terrorism.

Classifications of Cybercrimes: E-Mail Spoofing

<span style="display:inline-block;padding:.16em .6em;border:1.5px solid currentColor;border-radius:999px;font-size:.68em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75">High weight</span>

Definition. <mark>E-mail spoofing is sending an e-mail with a forged sender address or header so that it appears to come from a trusted source.</mark> IP spoofing is forging the source IP address in a packet header to hide the sender or impersonate another host.

Key points.

  1. Classification of cyber crime is by victim (person, property, government or society), and each class has its own examples: stalking, piracy and cyber terrorism respectively.
  2. In e-mail spoofing the attacker edits the From, Reply-To or Return-Path header, because the basic mail protocol SMTP does not verify the sender.
  3. Its purpose is phishing, fraud and spreading malware, since the victim trusts a message that seems to come from a bank, boss or friend.
  4. Prevention uses SPF (which servers may send for a domain), DKIM (digital signature on the mail), DMARC policy, spam filters and user awareness.
  5. IP spoofing writes a false source address in the IP header; it is used for denial-of-service attacks, session hijacking and bypassing address-based trust.
  6. IP spoofing is reduced by ingress and egress filtering at routers, packet inspection, and encrypted authenticated protocols.
  7. Software piracy is illegal copying or use of licensed software; prevention is licensing, activation and law.
  8. A trapdoor (backdoor) is a hidden entry point left in a program that bypasses normal authentication; a key logger records keystrokes secretly to steal passwords; prevention is code review, anti-malware and on-screen keyboards.

Answer frame. For the classification question, open with the basis (victim), draw the tree from the Introduction, then give one line per class with examples, and include e-mail spoofing, spamming, internet time theft and salami attack under crimes against property or person. For short notes, give each of the five items a two-line definition, working and prevention. For IP spoofing use points 5-6.

Asked: [14 marks] (Dec 2020) Write the short notes on: i) E-mail spoofing ii) Software Piracy iii) Trapdoors iv) Key loggers v) Spamming Asked: [7 marks] (Nov 2019) What do you mean by IP spoofing? Asked: [7 marks] (Jun 2020, Dec 2024, Dec 2025) What are the various classifications of Cyber Crime? Explain each in brief. Discuss the ways of classification of cyber crimes with an example for each. Explain different classifications such as e-mail spoofing, spamming, internet time theft and salami attack.

Spamming

<span style="display:inline-block;padding:.16em .6em;border:1.5px solid currentColor;border-radius:999px;font-size:.68em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75">Medium weight</span>

Definition. <mark>Spamming is sending unsolicited bulk messages, usually commercial or malicious, to many recipients.</mark> Spoofing is impersonating another person, address or system to gain trust.

Key points.

  1. E-mail spam is the commonest type: mass advertising, scams and phishing links sent to lists of harvested addresses.
  2. SMS and messaging spam sends unwanted texts and app messages, often with fraud links.
  3. Social media and comment spam floods forums and profiles with ads or malicious links.
  4. Search-engine (web) spam stuffs keywords to push pages up rankings, and spam bots create fake accounts.
  5. Spam wastes bandwidth and time, carries malware and phishing, and can be used for fraud.
  6. Spamming is prevented with spam filters, blacklists, CAPTCHA, not publishing e-mail addresses and never replying to spam.
  7. Spoofing prevention uses SPF, DKIM and DMARC checks, gateway filters, and training users to check the real sender address.

Answer frame. Open with both definitions; list types of spamming (points 1-4); state effects (5); then prevention of e-mail spoofing (7) and spam (6); close with layered technical and awareness defence.

Asked: [7 marks] (Jun 2020, Dec 2024) Define 'Spoofing' and 'Spamming' in detail. Describe types of spamming in cyber space and give some prevention mechanism regarding email spoofing.

Internet Time Theft

<span style="display:inline-block;padding:.16em .6em;border:1.5px solid currentColor;border-radius:999px;font-size:.68em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75">Low weight</span>

Definition. <mark>Internet time theft is the unauthorised use of another person's paid internet hours or account by a third party without permission.</mark>

Key points.

  1. The thief gets the victim's login and password by sniffing, guessing or insiders, and then surfs on the victim's account.
  2. The victim finds the bill or used hours higher than actual use, and pays for what the thief used.
  3. It is treated as theft of a service and is punishable under the IT Act, 2000 (unauthorised access and computer-related offences).
  4. The Colonel Bajwa case (Delhi, 1990s), where an outsider used a colonel's paid internet hours, is the standard example; State of Tamil Nadu v. Suhas Katti (2004) is cited as the first conviction under the IT Act.

Asked: [7 marks] (Nov 2023) What is internet time theft in cybercrime? What is the 1st cybercrime in India?

Salami attack/Salami Technique

<span style="display:inline-block;padding:.16em .6em;border:1.5px solid currentColor;border-radius:999px;font-size:.68em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;opacity:.75">High weight</span>

Definition. <mark>A salami attack is a fraud in which many tiny, unnoticeable amounts are shaved from many transactions or accounts and collected into a large sum.</mark>

Diagram.

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Key points.

  1. The term comes from slicing a salami sausage: each thin slice is not missed, yet all the slices together are the whole sausage.
  2. Yes, a salami attack can take a large sum, though not from one account: it works by accumulating a tiny slice from thousands or lakhs of accounts.
  3. Rounding-off technique: interest is calculated to fractions of a paisa and the program rounds down, sending the leftover fraction to the attacker's account.
  4. Penny shaving deducts a very small fixed amount, such as 50 paise, from every account, which customers ignore as a service fee.
  5. Worked example: 20,000 accounts losing Rs 0.50 each give Rs 10,000 a month, which is Rs 1,20,000 in a year, from a trivial deduction per customer.
  6. Information can also be gathered in slices: small pieces of data taken from many sources are combined into a valuable whole.
  7. It is done by an insider, usually a programmer, who alters the bank software (a logic bomb or modified routine) so that the fraud is repeated automatically.
  8. Adverse effects: banks lose money and public trust in electronic banking, honest staff are suspected, and the economy suffers from loss of confidence and higher security costs.
  9. Detection and prevention: audit trails and reconciliation of total interest against total credited, code review, separation of duties and customer statement checks.

Answer frame. Open with the definition and the origin of the term; draw the diagram; develop points 3-5 with the Rs 0.50 example; then effects (8); close with detection and prevention (9). For the 14-mark question spend the first half on points 1-2 (origin and why one attack can take a large sum) and the process (3-5).

Pitfall: Do not say one account loses a large amount; the large sum comes from very many tiny slices.

Asked: [14 marks] (Nov 2023) Where did the term Salami attack come from? Can a single salami attack take away a large sum of money from a single account? If yes explain the process. Asked: [7 marks] (Dec 2020, Jun 2025) What is Salami attack? How information can be gathered through Salami technique? What are the different techniques? Asked: [7 marks] (Jun 2020, Dec 2024) What do you mean by 'Salami attack'? What are its adverse effect on economic structure of society explain with example?

Last-minute revision

  • Cyber crime is an unlawful act with a computer as target, tool or place.
  • Classes by victim: person, property, government or society.
  • CIA triad: confidentiality, integrity, availability.
  • Threat is the danger, vulnerability the weakness, risk is likelihood times impact.
  • Challenges: anonymity, jurisdiction, scale, technology change, volatile evidence, low awareness.
  • E-mail spoofing forges the sender header; prevent with SPF, DKIM and DMARC.
  • IP spoofing forges the source IP address; prevent with ingress and egress filtering.
  • Spamming is unsolicited bulk messaging: e-mail, SMS, social media, search-engine spam.
  • Internet time theft is unauthorised use of someone's paid internet hours; Colonel Bajwa case.
  • Salami attack takes tiny slices from many accounts; rounding-off and penny shaving.
  • Salami example: 20,000 accounts times Rs 0.50 is Rs 10,000 a month.

Memory hooks

  • CIA: Confidential, Integral, Available.
  • Classes of crime: "PPG" for Person, Property, Government or society.
  • Salami: thin slices, thick sandwich; many pennies make a pile.
  • SPF plus DKIM plus DMARC: "who may send, is it signed, what to do".
  • Spoof is a costume; spam is a flood.

Coverage checklist

  • Introduction of Cyber Crime: definition, classification, modes, security threats, why cyber security (Q6, Q7, Q8).
  • Challenges of cyber crime: challenges and cyber terrorism (Q3, Q4).
  • Classifications of Cybercrimes: E-Mail Spoofing: classification of cyber crimes, short notes on five items, IP spoofing (Q1, Q12, Q13).
  • Spamming: spoofing, spamming types and prevention (Q11).
  • Internet Time Theft: definition and first cybercrime in India (Q5).
  • Salami attack/Salami Technique: origin, mechanism, techniques, effects (Q2, Q9, Q10).
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