modern cryptography dddd

8/13/2019 Modern Cryptography Dddd

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Modern Cryptography - An Overview

Contents Listing

Chapter 1: An overview of Cryptography

Section 1: Introduction

Section 2: Terminology and ConceptsSection 3: volution of cryptography

Section !: "ifferent forms of cryptography and their usage

Chapter 2: Symmetric#$ey cryptography

Section 1: %loc$ Ciphers &AS' "S' %lowfish(

Section 2: Stream Cipher &)C!(

Section 3: Symmetric#$ey algorithms # A comparison

Chapter 3: *u+lic#$ey cryptography

Section 1: )SA

Section 2: Chic$en and the egg situation # And its solutionSection 3: *rotocols using *u+lic#$ey cryptography

Chapter !: ,ash -unctions

Section 1: ."/

Section 2: The S,A family

Section 3: 0,I)L*L

Section !: ,ash -unctions # A comparison

Chapter /: Cryptanalysis

Section 1: 0hat is cryptanalysis

Section 2: Typical 0ea$nesses in algorithms

Chapter : Attac$s in cryptology

Section 1: Attac$s on the )C! algorithm

Section 2: Attac$s on the ."/ hash function

Section 3: %rute force and "ictionary attac$s

Chapter 4: 5ample C Source Code

# AS &)i6ndael(

# "S

# %lowfish# )C!

# )SA

# ."/

# S,A#1

# 0,I)L*L

Chapter 7: Conclusion

Section 1: ,ow to choose the algorithm for you

Section 2: Algorithms to stay clear on

Section 3: -inal tips and reminders

Section !: 8uic$ 8uestion answers


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Chapter 1 An Overview of Cryptography

Section 1 9 Introduction

Cryptography is the process +y which information is hidden It is in use all around us in the modern

world' whether we are logging in to a system' using a secured wireless internet connection' usingcash#cards at an AT. or ma$ing payments over the internet .odern "ay cryptography has given

us a sense of security with technology As always' a sense of security' and a lac$ of care' can +e

incredi+ly dangerous

0hilst cryptography is vital to the lives we live' all over the internet' you can see e5amples of

where too much trust is placed on its security This +oo$ will give readers a deep insight into not

only the mathematical wor$ings +ehind cryptographic algorithms' +ut into where and when

different algorithms should +e used and what it is that ma$es them strong' or wea$

*erhaps the more interesting chapters of this +oo$ will +e the ones which delve into cryptanalysis

and other attac$s on cryptography These sections of the +oo$ will hopefully provide you with agreater insight into' in my opinion' one of the most interesting su+6ects on the internet today and

prepare +udding developers for future challenges that may lie ahead

.ost of the algorithms descri+ed in this +oo$ will also +e lin$ed to an e5ample implementation in

the C programming language 0hilst $nowledge of this programming language is not essential' a

+asic $nowledge of how +itwise operations wor$ and the general synta5 of the language' should

help with your understanding I intend to ma$e my descriptions clear enough so that even those

with no programming $nowledge can follow them +y using the terminology section as an aid

0hether you are a teenager with an interest in computers' a student on the way to a career in

computer forensics' a software developer +uilding secure applications or 6ust one of those who has

to understand how everything wor$s' I hope this +oo$ is of great use to you and that you en6oy

reading it

Section 2 9 Terminology and Concepts

To understand some of the algorithms' a descriptions of algorithms' in this +oo$ you will need to

understand some of the following concepts and terms .any of you may +e a+le to s$ip through this

section' +ut please refer +ac$ to it if you ever get stuc$ understanding the way something is

e5plained

The first' and pro+a+ly most important' concept to get your head around is that on a computer

everything is stored as +its %its are +inary digits' they can yield one of two possi+le values' for the

purposes of this +oo$ we will refer to them as ; or

=off>' with a +it that is =on> holding a value of 1' and a +it that is =off> holding a value of


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If' however' the 32 +it integer &! +ytes(


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?ow' all forms of cryptography descri+ed in this +oo$ will reuire +itwise operations The

following list of +ullet points goes through the $ey +itwise operations and what they do

Left Shift. The left shift operation shifts all of the +its in

the num+er left -or e5ample' the num+er

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