Encryption step 1, Break the message into blocks of length 4, step 2 reorder each block, so a 4 length block [L1,L2,L3,L4] converts to [L2,L3,L4,L1], for example [MATH] -> [ATHM] , step 3 convert to mod 26 numbers and add [5,10,15,20] to each block

For example [ATHM] -> [0,19,7,2] -> [5,29,22,32] = [5,3,22,6]

step 4 convert back to letters.

solve problems a, b, and c from picture below.

)11 Sa a 4 lotta block 2 non 610 IS 20 En scuMATH PALS c)