1. Compute the following equations a) 11mod20= b) 11mod20= c) 33mod2= d) 24mod26= 2. Given that the key is 6 and the cipher used for encryption is Caesar cipher, read the following question and answer the questions correctly. engz oy znk iuaxyk tgsk? 3. Given that the key is 2, use the zig-zag cipher to encrypt the message "A world in which individuals, institutions and organizations are equipped with the knowledge, skills and other capacities to overcome global challenges