perfect secrecy

SUBMITTED BY: maloans

DATE: Feb. 2, 2018, 1:37 a.m.

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  1. Equivalence of
  2. Definitions
  3. • DEF1 㱻 DEF2
  4. • If plain-space = cipher-space = key-space:
  5. DEF1 㱻 DEF2 㱻 DEF3
  6. • Perfect secrecy refers to all definitions
  7. THM: Shannon secrecy and message
  8. ndistinguishability are equivalent. When
  9. restricting to key ambiguity
  10. s equivalent as well.
  11. LEMMA: implies not perfectly secret.
  12. |P| = |C| = |K |
  13. |K | < |P|
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