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E-commerce Security Requirements

E-commerce security refers to the protection of e-commerce assets from unauthorized access, use, alteration, or destruction. Because financial transactions and sensitive information (like credit card numbers, passwords, and personal details) are involved, strong security is essential in e-commerce systems.

Key E-commerce Security Requirements:

• Authentication: Ensures that the parties involved (both buyer and seller) are who they claim to be.
• Authorization: Grants specific permissions to authenticated users.
• Confidentiality: Ensures that data is accessible only to authorized individuals.
• Integrity: Ensures that data is not altered during transmission or storage.
• Non-Repudiation: Prevents parties from denying their actions.

What is Information Security?

Information security means protecting data from theft, alteration, destruction, disclosure, or denial of access. It has traditionally relied on physical measures (e.g., locked cabinets) and administrative controls (e.g., personnel screening). Even today, some reliance on physical security remains.

Modern Information Security Needs

With increased computer usage, automated tools are now essential for protecting stored information. As network usage grows, securing data during transmission has become equally essential.

Aspects of Information Security (ITU-T X.800/1205)

• Security Attack: Any action that compromises system security.
• Threat: A potential violation, defined as capability plus intent.
• Security Mechanism: Any policy

Defining Creams and Pastes

Creams

Creams are semi-solid emulsions used externally on the skin. They can be either oil-in-water (O/W) or water-in-oil (W/O) emulsions. They are used for moisturizing, healing, or delivering drugs through the skin.

• Example: Cold Cream (W/O), Vanishing Cream (O/W)

Pastes

Pastes are also semi-solid but contain a high amount of insoluble powders (around 25-50%), making them stiffer and more absorptive. They form a protective layer on the skin and are used where longer contact is needed.

• Example: Zinc Oxide Paste

Understanding Pharmaceutical Aerosols

Aerosols are pressurized dosage forms that release active ingredients as a fine spray, mist, or foam when a valve is opened. They use propellants (like hydrocarbons or compressed... Continue reading "Pharmaceutical Dosage Forms: Creams, Powders, and Solutions" »

The shoulder joint, also known as the glenohumeral joint, is a ball-and-socket type synovial joint that allows a wide range of motion in the upper limb. Here’s a breakdown of its key features:

🦴 Bones Involved

1. Humerus – the upper arm bone; its head forms the "ball."
2. Scapula (shoulder blade) – contains the glenoid cavity, which forms the "socket."
3. Clavicle (collarbone) – indirectly involved, connecting the shoulder to the axial skeleton via the acromioclavicular and sternoclavicular joints.

🦾 Movements Allowed

Because it is a ball-and-socket joint, it allows:

• Flexion and Extension
• Abduction and Adduction
• Medial (internal) and Lateral (external) Rotation
• Circumduction (circular movement)

💪 Muscles Involved

Key muscles acting on the shoulder... Continue reading "Shoulder Joint Anatomy: Bones, Muscles, Movement, & Injuries" »

World War II: Major Combatants & Events

Sides and Leaders of WWII

• Allied Powers:
  • Countries: U.S., U.K., France, China, Soviet Union
  • Leaders: Winston Churchill (U.K.), Franklin D. Roosevelt / Harry S. Truman (U.S.), Joseph Stalin (Soviet Union), Charles de Gaulle (France), Chiang Kai-shek (China)
• Axis Powers:
  • Countries: Germany, Japan, Italy
  • Leaders: Adolf Hitler (Germany), Benito Mussolini (Italy), Emperor Hirohito / Hideki Tojo (Japan)

Molotov-Ribbentrop Pact (1939)

Signed in 1939 by Germany and the Soviet Union, this pact included a secret protocol that divided territories:

• Germany: Western Poland and part of Lithuania
• Soviet Union: Eastern Poland, Finland, Estonia, Latvia, and parts of Romania

Nuclear Bombings of Japan (1945)

Hiroshima was bombed... Continue reading "Major World Conflicts and Historical Turning Points" »

Information Systems Fundamentals

Information Systems (IS): A set of interrelated components that collect, retrieve, process, store, and distribute information to support decision-making in an organization.

The 5 Components of IS

• Hardware
• Software
• Data
• Procedures
• People

Emerging Digital Firms

Digital firms integrate technology into all aspects of operations (e.g., Zipcar, Amazon delivery, Instacart). These models proved essential during COVID-19 and labor shortages.

5 IT Megatrends

• Mobile
• Social Media
• Internet of Things (IoT)
• Cloud Computing
• Big Data

6 Strategic Business Objectives

1. Operational excellence
2. New products, services, and business models
3. Customer and supplier intimacy
4. Improved decision-making
5. Competitive advantage
6. Survival

Dimensions of IS

Organizations,... Continue reading "Core Information Systems and Business Technology Principles" »

What is Business Optimization?

Business Optimization (BO) involves leveraging technologies and data-driven approaches to achieve improvements while minimizing costs and resources.

Subjective Elements in Business Optimization

While Business Optimization capitalizes on AI algorithms, it also gives due credence to non-quantifiable aspects of AI. These unquantified concepts are subjective. The acknowledgment and insertion of the subjective element in the optimization of business processes are crucial.

Human vs. Machine Intelligence

Machines are very good at mimicking human functions. Gaming, autonomous driving, robotic surgery, and medical diagnostics are all capabilities that machines can handle well. Computers are phenomenally better at undertaking... Continue reading "Maximizing Business Efficiency with AI and Subjective Elements" »

Pharmacological Principles

• Agonist: A substance that binds to a receptor and activates it, producing a biological response. Example: Beta-2 adrenergic agonists.
• Antagonist: A substance that binds to a receptor and blocks or dampens its activation, reducing or preventing a biological response. Example: Beta-blockers.

Pharmacokinetics and Metabolism

• Bioavailability: The proportion of a substance that enters circulation and becomes available to exert biological effects. Factors: Route of administration, metabolism.
• Enzyme Induction: The process where a substance increases the production or activity of an enzyme, leading to increased metabolism of a specific substance. Example: Rifampicin.
• Enzyme Inhibition: The process where a substance decreases the

Principle of Chromatography - Chromatography is a separation method where the analyte is combined within a liquid or gaseous mobile phase, which is pumped through a stationary phase. Usually, one phase is hydrophilic and one is lipophilic. The components of the analyte interact differently with these two phases. Depending on their polarity, they spend more or less time interacting with the stationary phase. This leads to the separation of different components present in the sample. Each sample component elutes from the stationary phase at a specific time called retention time.

Types of Chromatography

1. Liquid Chromatography - This type of chromatography is used to separate and analyze non-volatile compounds. In this technique, the sample is dissolved

Motion and Forces

• Distance: distance = speed × time
• Acceleration: a = (v - u) / t (a = acceleration, v = final velocity, u = starting velocity, t = time)
• Force: F = m × a (Force = mass × acceleration)
• Weight: W = m × g (g = gravitational field strength; on Earth, g = 9.8 N/kg)
• Momentum: p = m × v (p = momentum)
• Motion (Time Unknown): v² - u² = 2 × a × x
• Force from Change in Momentum: F = (m × Δv) / Δt

Energy

• Kinetic Energy: KE = ½ × m × v²
• Gravitational Potential Energy: GPE = m × g × h
• Work Done: E = F × d (Work = Force × distance)
• Power: P = E / t (Power = Energy ÷ Time)
• Efficiency: efficiency = (useful energy out) ÷ (total energy in)
• Elastic Potential Energy: E = ½ × k × x²

Electricity and Magnetism

• Charge Flow: Q = I × t (Q =