week1 - 6/22/2010 SIT281 Introduction to Cryptography Week...

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6/22/2010 1 SIT281 Introduction to Cryptography Week 1 About the Unit and Cryptography The Unit Guide… > .. is on DSO and you should read through it carefully. > The outline for what we cover each week is there. > We rely heavily on the textbook, so you will need it right away. Check the unit guide and the book store for the details.
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6/22/2010 2 Assignments > There will be two assignments. See the unit guide for the due dates and write them in your diary. (August 12 and September 16.) > When they are ready, they will be posted on DSO. > They are each worth 20% of the total value of your final mark. The exam > The exam is worth 60% of your final mark. > There are old exams in the library that you can access. > In the last week of classes, we will run through a small sample version of an exam for you to try.
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6/22/2010 3 The pracs > We will be using Maple9 Classic software for the practical classes. > Appendix B of the text (see the back pages) tells you how to download the crypto.mws file with crypto commands into your version of Maple. > All students can download the Maple software on a home machine from DSO as will be indicated in the first prac information. The pracs cont’d > You do not need prior knowledge of Maple to do the > You do not need prior knowledge of Maple to do the pracs. Everything you need will be supplied during this unit. > There are lots of examples in Appendix B and we will post more information on DSO. > The practical in week 1 is simply to help you to get used to the software so that you can get right into the material in week 2.
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6/22/2010 4 Now let’s take a look at some crypto! > Cryptography comes from the Greek kryptos meaning ‘hidden’ and grafo, to write. > You will also see the word cryptology used; the latter part is from logia, to study. > The point of cryptography is to protect information from some people while giving others easy access. CONTENT OF THE UNIT > This unit looks at the role of cryptography in securing information. > It presents the methods used to protect information from over 2000 years ago to the present. > We look at some of the current applications in > We look at some of the current applications in security management such as hash functions and secret sharing schemes.
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6/22/2010 5 The history > Cryptography has been around for a long time: a well known system is supposed to have been used by Julius Caesar, about 100BC to 44BC. > Up until the 19’th century, most systems used were just sophisticated versions of the earliest ones just sophisticated versions of the earliest ones. How it works > The underlying idea in ‘hiding’ a message is to ± take the written form (plaintext) ± convert to a numerical form ± apply a formula to the numbers ± convert back to written (ciphertext) ± send the new written message
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6/22/2010 6 The basic idea cont’d > Of course, the legitimate receiver of the message needs to know the formula in order to convert back. > The good thing is that simply knowing one formula means
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This note was uploaded on 08/12/2010 for the course CRYOPTOGRA 3232 taught by Professor Jhhgjhgjh during the Spring '10 term at Trinity College, Hartford.

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week1 - 6/22/2010 SIT281 Introduction to Cryptography Week...

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