18.5 - Conclusion
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Practice Questions
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What is symmetric key encryption?
💡 Hint: Think about the lock and key analogy.
Give an example of plaintext.
💡 Hint: What does a message look like before it is scrambled?
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Interactive Quizzes
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What type of encryption uses the same key for both encrypting and decrypting?
💡 Hint: Think of the lock and key analogy.
Is it possible for two parties to establish a common key over a public channel?
💡 Hint: What did we learn about Diffie and Hellman's contributions?
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Challenge Problems
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Explain how an attacker might try to break symmetric key encryption and what measures can be taken to protect against such attacks.
💡 Hint: Consider what makes a key difficult to guess.
Using what you've learned about Diffie-Hellman, create a simplified example step-by-step showing how Sita and Ram agree on a key.
💡 Hint: Focus on the steps needed for agreement and remind yourself of what they exchange.
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