A.Explain why the ISO summation code has the required effect, i.e., that with the computed bytesMk andMk+1 inserted, the values of C0 and C1 will be equal to zero. Check this by trying a small example...

the computed bytesMk andMk+1 inserted, the values of C0 and C1 will be equal

to zero. Check this by trying a small example using 10 bytes (i.e., with n = 10 )

and with k = 6.

B. Investigate the history of theDES encryption algorithm, since its introduction

in 1975.Would you trust it to protect your secrets?