Man-in-the-middle attacks in Computer Networks - Mini Project: Build & Apply

Understanding Man-in-the-middle Attacks

📖 Scenario: You are learning about network security. Imagine you are sending a secret message to a friend over the internet. A man-in-the-middle attack is when someone secretly listens to or changes your message without you knowing.

🎯 Goal: Build a simple step-by-step explanation of how a man-in-the-middle attack works using a list of communication steps between two people and an attacker.

📋 What You'll Learn

Create a list called communication_steps with exact messages exchanged

Add a variable called attacker_position to show where the attacker is in the communication

Use a loop with step and message to go through communication_steps

Add a final statement showing the attacker intercepts the message

💡 Why This Matters

🌍 Real World

Understanding man-in-the-middle attacks helps people protect their private information when using the internet or other networks.

💼 Career

Network security professionals use this knowledge to design systems that detect and prevent such attacks, keeping data safe.

1

Create the communication steps list

Create a list called communication_steps with these exact strings in order: 'Alice sends message to Bob', 'Bob receives message', 'Bob replies to Alice', 'Alice receives reply'.

Computer Networks

# Create the list communication_steps with the exact messages
# Your code here

Need a hint?

Use square brackets to create a list and include the exact messages as strings.

2

Add attacker position variable

Add a variable called attacker_position and set it to the string 'between Alice and Bob' to show where the attacker is located.

Computer Networks

communication_steps = ['Alice sends message to Bob', 'Bob receives message', 'Bob replies to Alice', 'Alice receives reply']
# Add attacker_position variable below
# Your code here

Need a hint?

Use a simple string variable to show the attacker's location.

3

Loop through communication steps

Use a for loop with variables step and message to go through enumerate(communication_steps, 1). This will show each step number and message in order.

Computer Networks

communication_steps = ['Alice sends message to Bob', 'Bob receives message', 'Bob replies to Alice', 'Alice receives reply']
attacker_position = 'between Alice and Bob'
# Loop through communication_steps with step and message
# Your code here

Need a hint?

Use enumerate to get step numbers starting at 1.

4

Add attacker interception statement

Add a final statement that shows the attacker intercepts the message by creating a string interception with the exact text 'Attacker intercepts message between Alice and Bob'.

Computer Networks

communication_steps = ['Alice sends message to Bob', 'Bob receives message', 'Bob replies to Alice', 'Alice receives reply']
attacker_position = 'between Alice and Bob'
for step, message in enumerate(communication_steps, 1):
    pass  # Looping through steps and messages
# Add interception statement below
# Your code here

Need a hint?

Create a string variable with the exact text showing the attacker intercepts the message.