Question

You are wanting to communicate secret messages with your friend, and you choose to do this with matrices. The encoding matrix that you choose to use is 2 -2 -1 6 You use the following key to convert your message into a string of numbers, where "O" is used as a placeholder where required. A B C D EF G H IJ K L M 10 2 11 24 19 5 25 20 3 7 16 6 14 N O P QRST U V W X Y Z 9 17 12 18 18 26 4 13 23 22 15 21 The matrix equation that you use to encode is AM = E, where matrix M contains the message and E is the encryption. You share these details about how the message is encrypted with your friend. a) Encode the message "what is up" into a string of numbers for transmission to your friend Show the matrix multiplication step in full. b) Solve for the decoding matrix. c) Your friend sends you a reply of "-16, 93, 12, 94, -12,51, 50, -25". Use your answer to part (b) to decode it. Show the matrix multiplication step in full.

Answer 1

dei consrusnes modul 27 231 1101回 ,01=J-32 є,97,-32, 141,-1,18,34,-18,-16, s8 ヤー ッ CO 9 3e 710-> 114 3911-<<1=117,01彡 3893 32 30 3800 5 l 710 47501 5 25 NOTHIN 17 hme d 27 33o