Podcast
Questions and Answers
What is a key feature that distinguishes stream ciphers from block ciphers?
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?
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?
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?
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?
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?
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?
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?
Why is the encryption process or system called a stream cipher?
In the context of the stream cipher, what does XOR operation refer to?
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?
Why is it important for the pseudo random generator in a stream cipher to extend or stretch bits?
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