Question: If an encryption algorithm is known but not the key, how secure is the scheme? If a key is known but not the algorithm, how

  1. If an encryption algorithm is known but not the key, how secure is the scheme?
  2. If a key is known but not the algorithm, how secure is that scheme?
  3. State the two basic operations used in a symmetric encryption algorithm.
  4. Explain the difference between a monoalphabetic cipher and a polyalphabetic cipher.
  5. State the two general approaches of attacking a cipher.

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