Question $14(0\mathrm{.}5$ points$)$

The dlog problem becomes easier if the order of the group has small prime factors.

True

False

Question $15(0\mathrm{.}5$ points$)$

In a Chosen$-$ciphertext attack the adversary is additionally able to obtain $($some information about$)$ the decryption of ciphertexts of its choice.

True

False

Question $16(0\mathrm{.}5$ points$)$

Data Encryption Standard $($DES$),$ was designed by

Intel

IBM

HP

Sony