Certificate-based authentication in IOT Protocols - Mini Project: Build & Apply

Certificate-based Authentication Setup for IoT Devices

📖 Scenario: You are working on a smart home system where IoT devices must securely connect to a central server. To ensure only trusted devices connect, you will set up certificate-based authentication.This means each device will have a unique certificate signed by a trusted authority. The server will check these certificates before allowing access.

🎯 Goal: Build a simple certificate-based authentication setup by creating device certificates, configuring trusted authorities, and verifying device identity using certificates.

📋 What You'll Learn

Create a dictionary called device_certificates with device IDs and their certificate strings

Create a list called trusted_authorities containing the names of trusted certificate authorities

Write a function called authenticate_device that takes a device ID and checks if its certificate is signed by a trusted authority

Print the authentication result for a specific device ID

💡 Why This Matters

🌍 Real World

IoT devices use certificate-based authentication to securely connect to servers, preventing unauthorized access.

💼 Career

Understanding certificate-based authentication is essential for roles in IoT security, network administration, and DevOps.

1

Create device certificates dictionary

Create a dictionary called device_certificates with these exact entries: 'device1': 'certA_signed_by_CA1', 'device2': 'certB_signed_by_CA2', 'device3': 'certC_signed_by_CA3'.

IOT Protocols

# Create the device_certificates dictionary with device IDs and their certificates
# Your code here

Need a hint?

Use curly braces to create a dictionary with keys as device IDs and values as certificate strings.

2

Define trusted certificate authorities

Create a list called trusted_authorities containing these exact strings: 'CA1', 'CA2'.

IOT Protocols

device_certificates = {
    'device1': 'certA_signed_by_CA1',
    'device2': 'certB_signed_by_CA2',
    'device3': 'certC_signed_by_CA3'
}

# Create the trusted_authorities list with 'CA1' and 'CA2'
# Your code here

Need a hint?

Use square brackets to create a list with the trusted authority names as strings.

3

Write authentication function

Write a function called authenticate_device that takes a parameter device_id. Inside the function, get the certificate from device_certificates using device_id. Then check if the certificate string contains any trusted authority from trusted_authorities. Return true if yes, otherwise false.

IOT Protocols

device_certificates = {
    'device1': 'certA_signed_by_CA1',
    'device2': 'certB_signed_by_CA2',
    'device3': 'certC_signed_by_CA3'
}

trusted_authorities = ['CA1', 'CA2']

# Define the authenticate_device function below
# Your code here

Need a hint?

Use a for loop to check each trusted authority in the certificate string. Use device_certificates.get(device_id, '') to safely get the certificate.

4

Print authentication result

Print the result of calling authenticate_device with the argument 'device3'.

IOT Protocols

device_certificates = {
    'device1': 'certA_signed_by_CA1',
    'device2': 'certB_signed_by_CA2',
    'device3': 'certC_signed_by_CA3'
}

trusted_authorities = ['CA1', 'CA2']

def authenticate_device(device_id):
    cert = device_certificates.get(device_id, '')
    for authority in trusted_authorities:
        if authority in cert:
            return True
    return False

# Print the authentication result for 'device3'
# Your code here

Need a hint?

Use print(authenticate_device('device3')) to show if device3 is authenticated.