$(1$ point$)$ This question concerns block cipher modes. We will use a simple affine cipher, which can be expressed in $C$ as follows.

char cipher$($unsigned char block, char key$)$

$\{$

return $(key+11**block)\%256$;

Note that the block size is $8$ bits, which is one byte $($and one ASCII character$).$ We will work with the fixed key $0x08.$

$0$:

b$)$ Encrypt the plaintext "fifty" using ECB mode. Please enter your answer in hex.

$0x$

c$)$ Encrypt the plaintext "nifty" using $CFB$ mode. Please enter your answer in hex.

$0>$

d$)$ Encrypt the plaintext "thrifty" using $CBC$ mode. Please enter your answer in hex.

$0x$

e$)$ Encrypt the plaintext "spiffty" using OFB mode. Please enter your answer in hex.

$0x$