1. In the 27 -letter alphabet use the affine enciphering transformation with key a=13, b=9 to encipher the message " HELP ME".

 

 

2.Using frequency analysis, crptanalyze and decipher the following message, which you know was enciphered using a shift transformation of single-letter plaintext message units in the 26-letter alphabet. PZ[ZKZENVDRUXNTNLZGYMZGMAXYKXJN