Question

AES/Cryptography:

(T/F) Good quality of diffusion makes the relation between ciphertext and the key complex

(T/F) As long as an initialization vector is randomly chosen, it is safe to use it with the modes of operation that require an IV.

(T/F) The block size of the AES must be the same as the key size

(T/F) The CBC mode does not require padding

(T/F) The CTR mode does not require an IV

Answer 1

ANSWERS -

1) FALSE

Confusion is the relation between the ciper text and encryption key more complex whereas diffusion makes the plain text and cipher text relation complex.

2) TRUE

Using randomly chosen IV is safer because multiple messages with same key and same IV will lead to various crypto attacks.

3) FALSE

It is not required to have same block size and keysize for AES because there is no as such relationship between the two.

4) FALSE

CBC mode do require padding so that they can encrypt data of variable length whereas CFB or OFB mode doesn't require padding.

5) FALSE

CBR mode does require an Initialization Vector, which is to be random when starting an cipher text.

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