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MMLU-Pro / 10568 / Can a stream cipher have perfect secrecy?

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Can a stream cipher have perfect secrecy?

category

computer science

options

  1. Yes, if the PRG is really “secure”
  2. No, because perfect secrecy is not possible in any cipher
  3. Yes, if the stream cipher is implemented correctly
  4. No, since the key is shorter than the message
  5. Yes, every cipher has perfect secrecy
  6. Yes, if the key is longer than the message
  7. No, only block ciphers can have perfect secrecy
  8. Yes, if the key is used only once
  9. No, since the key is reused for the stream cipher
  10. No, there are no ciphers with perfect secrecy

src

ori_mmlu-computer_security

Discussion

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Source and history

upstream_id / Original problem ID
10568
task_id
3c4c150a-45cd-5198-abe3-3aedd6a681c9
task_key
default--test--10568
task_revision_id
1
config / split
default / test

Official source

initial import