Encryption Attacks

Question 1

Ciphertext-only attack

Answer 1

deduce the decryption key or plaintext by only observing ciphertext.

one-time pad is unconditionally secure against ciphertext-only attack.

Question 2

Known-plaintext attack

Answer 2

using a quantity of plaintext and corresponding ciphertext

Question 3

Chosen-plaintext attack

Answer 3

choose plaintext and is then given corresponding ciphertext

Question 4

Adaptive chosen-plaintext attack

Answer 4

chosen-plaintext attack where the choice of plaintext may depend on the ciphertext received from previous requests

Question 5

Chosen-ciphertext attack

Answer 5

select the ciphertext,
then the corresponding plaintext is given

Question 6

Adaptive chosen-ciphertext attack

Answer 6

chosenciphertext attack where the choice of ciphertext may
depend on the plaintext received from previous
requests

Question 7

choose plaintext and is
then given corresponding ciphertext

Answer 7

Chosen-plaintext attack -

Question 8

using a quantity of
plaintext and corresponding ciphertext

Answer 8

Known-plaintext attack

Question 9

deduce the decryption
key or plaintext by only observing ciphertext

Answer 9

Ciphertext-only attack

Question 10

chosen-ciphertext attack where the choice of ciphertext may depend on the plaintext received from previous requests

Answer 10

Adaptive chosen-ciphertext attack

Question 11

select the ciphertext, then the corresponding plaintext is given

Answer 11

Chosen-ciphertext attack

Question 12

chosen-plaintext attack where the choice of plaintext may depend on the ciphertext received from previous requests

Answer 12

Adaptive chosen-plaintext attack