CS 450/650 Fundamentals of Integrated Computer Security

Spring 2012

Homework 1 : Cryptography and Authentication

Due on Wednesday, Feb 22 at 11:00 am

1 : Consider the following encrypted text

JLQEBO: TEXQ AFA VLR IBXOK FK PZELLI QLAXV
PLK: ELT QL TOFQB
JLQEBO: TEXQ AFA VLR TOFQB?
PLK: F ALK'Q HKLT, QEBV EXSBK'Q QXRDEQ RP ELT QL OBXA VBQ!

Decrypt it using the tool available at http://www.simonsingh.net/The_Black_Chamber/caesar.html. What is the plain text? What is the key?

The following problems are from the text book (Stallings and Brown, 2nd edition):

Chapter 1: 5 and 6

Chapter 2: 2, 5 and 9

Chapter 3: 1, 3 and 6

Chapter 4: 8

What to turn in: A softcopy of your solutions (could be a scanned version of the hard copy) to be uploaded as a single file to WebCampus.