4005-800-70 Theory of Computer Algorithms
Encrypted Grades

Procedure for Decrypting Grades
Example Grade File
Encrypted Grade Files

1. Obtain your secret key from me, in person. You must come to my office and show me your student ID. Your secret key is a 16-digit hexadecimal number composed of the numerals 0-9 and the letters a-f.
    
2. Download your own encrypted grade file from the Encrypted Grade Files section below and store it in a file on your machine.
    
3. Run the encrypted message viewer program, which is installed on the Computer Science Department computer systems. In your Computer Science Department account, type this command:
    
   java -classpath /home/fac/ark/public_html/cscl/lib edu.rit.crypto.View file
    
   replacing "file" with the name of the file where you downloaded your encrypted grade file. Enter your secret key when the program asks for it.

The encrypted message viewer program is part of the Computer Science Course Library. You may install the Library on your own personal computer so you can view your grades on your own system. To learn how the encrypted message viewer program works, you may examine the Java source code:

Class edu.rit.crypto.View
Class edu.rit.crypto.OneTimePadOutputStream

You can test the above procedure using the example grade file below. It has been encrypted with the following secret key: 9ca7 12fc 3cc1 f341

example

atg2335 axs5624 axs9690 bjp6924 cch5203

cnp5918 cpk8576 cxt6239 dan0337 djs2575

gjs5033 jxk5005 jxv0462 kal4249 kwh4660

kxp0079 kxt9094 mcc5651 mmf7604 mss6938

pbj7652 piw4019 prs5956 pxd9974 rrj0975

van6136 vdc5700 vrs5368 vxp8374 wbb2544

Theory of Computer Algorithms 4005-800-70 Winter Quarter 2003

Course Page

Alan Kaminsky • Department of Computer Science • Rochester Institute of Technology • 4486 + 2220 = 6706

Home Page

Copyright © 2003 Alan Kaminsky. All rights reserved. Last updated 11-Dec-2003. Please send comments to ark­@­cs.rit.edu.