Lecture 9: Stream Ciphers and Multi-Message Security

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What is a key feature that distinguishes stream ciphers from block ciphers?

Support for key reusability (correct)

Utilization of large keys

Incorporation of complex substitution-permutation networks

Exclusive use of XOR operation

In the context of stream ciphers, what does multi-message security aim to address?

Known-plaintext attacks

Ciphertext-only attacks

Chosen-plaintext attacks

Key exhaustion attacks (correct)

What analogy is drawn between stream ciphers and one-time pad schemes at a high-level?

Usage of pseudo-random generators (correct)

Employment of complex substitution boxes

Utilization of asymmetric encryption

Restrictions on key size

What is the primary function of the XOR operation in stream ciphers?

Facilitate the encryption process Signup and view all the answers

How does the size of the key space in stream ciphers compare to block ciphers?

Key space in stream ciphers is significantly smaller Signup and view all the answers

What is the main difference between the key space and the message space in the stream cipher discussed?

The message space is significantly larger than the key space. Signup and view all the answers

How does the stream cipher differ from a one-time pad (OTP) in terms of key generation?

The stream cipher uses a shorter key than OTP. Signup and view all the answers

Why is the encryption process or system called a stream cipher?

It processes data in small bits like a stream. Signup and view all the answers

In the context of the stream cipher, what does XOR operation refer to?

A mathematical operation that combines two values. Signup and view all the answers

Why is it important for the pseudo random generator in a stream cipher to extend or stretch bits?

To improve the security of the encryption process. Signup and view all the answers

Lecture 9: Stream Ciphers and Multi-Message Security

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Questions and Answers

What is a key feature that distinguishes stream ciphers from block ciphers?

In the context of stream ciphers, what does multi-message security aim to address?

What analogy is drawn between stream ciphers and one-time pad schemes at a high-level?

What is the primary function of the XOR operation in stream ciphers?

How does the size of the key space in stream ciphers compare to block ciphers?

What is the main difference between the key space and the message space in the stream cipher discussed?

How does the stream cipher differ from a one-time pad (OTP) in terms of key generation?

Why is the encryption process or system called a stream cipher?

In the context of the stream cipher, what does XOR operation refer to?

Why is it important for the pseudo random generator in a stream cipher to extend or stretch bits?

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