10 Questions
What is a key feature that distinguishes stream ciphers from block ciphers?
Support for key reusability
In the context of stream ciphers, what does multi-message security aim to address?
Key exhaustion attacks
What analogy is drawn between stream ciphers and one-time pad schemes at a high-level?
Usage of pseudo-random generators
What is the primary function of the XOR operation in stream ciphers?
Facilitate the encryption process
How does the size of the key space in stream ciphers compare to block ciphers?
Key space in stream ciphers is significantly smaller
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.
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.
Why is the encryption process or system called a stream cipher?
It processes data in small bits like a stream.
In the context of the stream cipher, what does XOR operation refer to?
A mathematical operation that combines two values.
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.
Explore the concept of stream ciphers and how pseudo random generators are used to encrypt long messages with short keys. Understand the limitations of stream ciphers such as key reusability and delve into the concept of multi-message security.
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