Information Engineering - I0n
ASSIGNMENT DETAIL   Back

Insert Date:4/25/2005
Date Assigned:4/25/2005
Date Due:4/27/2005
Assignment:Communications & encryption using fiber optics

1) Please read the tutorial at the site below. Then email me the answers to the questions 2-4 below using full sentences:

2) Assuming that Alice stills use a red flashlight, and Bob is sending on green, please decode this "multiplexed" message from Alice + Bob sending simultaneous light pulses that arrive in this sequence:

green- yellow- green- dark- red- yellow- yellow- green

3) Alice encrypted her message using XOR. Her key is the 8-bit ascii for ~. What was her original 8 bit signal? What was her ascii signal symbol?

4) Bob's 8 bit message is still needing to be encrypted. Using the Excel spreadsheet on private keys, assume N= 64, A = 471, and B = 237. Send me the encrypted 8 bit signal by using an X(0) based on the number of letters in your last name. List your X(0), the Mod (X(1),N), and the encrypted 8 bit signal. Does it correspond to any ascii code?


Assignment Links:

Frequency division multiplexing on fiber