Question

Consider the following AES mode: ECB, CBC, CFB, OFB, CTR. Which mode is secure against: -...

Consider the following AES mode: ECB, CBC, CFB, OFB, CTR.

Which mode is secure against:

- COA
- CPA
- KPA
- CCA

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Answer #1
  • if AES is a secure PRP, then AES-CBC and AES-CTR are CPA secure (but not CCA)
  • in order to be CCA secure, we need integrity (preventing attacker from modification of the message/ciphertext)
  • malleability: altering the ciphertext still produces valid plaintext upon decryption
  • AES CBC and CTR are malleable, so we need something more

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