urgent 《Internet Infrastructure Security》
1. (Affine Cipher) Recall that the encryption function for the Affine Cipher is EK(m) = (a ×
m + b) mod 26. Moreover, not all values in {0, 1, · · · , 25} can be used for a. To illustrate
it, consider a = b = c = 10. Explain why a = 10 cannot be used...