What is the word 'security value' means in AES encryption algorithm? -


this question

i studied lot trying answer these 3 questions, still can't it.

  • in question 1: don't know definition of 'security value' .
  • in question 2&3 : can't see security weaknesses in scheme.

the terminology confusing, call value initial vector (iv). point of using random iv if encrypt same message twice, not same ciphertext twice, necessary prevent leaking of information (for example, see happens in ecb mode -- @ penguin images).

to second question, general security requirement if attacker supplies number of inputs (m_i), should not able figure out other inputs has no control over. understand why, @ padding oracle attacks such poodle. if understand poodle, should able come similar on proposed scheme.

here's hint on problems may happen. think case of m_1 = m_2. c_2? i'm not going solve homework you, should point in right direction.


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