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Home » Quiz for Module 2 Lecture 3 – Classic ciphers

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Quiz for Module 2 Lecture 3 – Classic ciphers

Antti Hakkala 21/10/2026

This quiz covers the topics in the third lecture in Module 2. The questions are multiple choice questions. The quiz is passed when all questions have been answered correctly.

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Question 1 of 6

1. Question

What does the concept of perfect secrecy imply in cryptography?

The encryption algorithm is publicly known
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The key size is sufficiently large
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The ciphertext provides no information about the plaintext, even with infinite computational resources
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The encryption process is fast and efficient
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Question 2 of 6

2. Question

The one time pad…

Uses public and private keys to provide perfect secrecy
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Requires that both public and private keys are as long as the message being encrypted
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Requires that the key is as long as the message being encrypted
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Requires that the key is coded in base-64 format
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Question 3 of 6

3. Question

What type of cipher is the Caesar Cipher?

Stream cipher
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Transposition cipher
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Elliptic curve cipher
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Substitution cipher
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Question 4 of 6

4. Question

Which of the following is a weakness of transposition ciphers?

They do not change the frequency of letters, making them vulnerable to frequency analysis
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They are too complex to implement
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They require a large key size
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They can only encrypt numerical data
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Question 5 of 6

5. Question

Why is the one-time pad considered to be perfectly secure?

Because it is easy to implement
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Because it relies on the difficulty of factoring large prime numbers
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Because the ciphertext provides no information about the plaintext, assuming the pad is random and used only once
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Because it uses a complex mathematical algorithm
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Question 6 of 6

6. Question

If the key used in a one-time pad encryption is lost, is it possible to recover the original message?

Yes, by using brute force to guess the key
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Yes, by analyzing the frequency of characters in the ciphertext
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Yes, by using a pseudorandom number generator to regenerate the key
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No, it is theoretically impossible to recover the message without the key
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