Hacking Secret Ciphers with Python 无水印pdf

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Hacking Secret Ciphers with Python 英文无水印pdf pdf所有页面使用FoxitReader和PDF-XChangeViewer测试都可以打开 本资源转载自网络,如有侵权,请联系上传者或csdn删除 本资源转载自网络,如有侵权,请联系上传者或csdn删除
OK2y!工^o|Nq TTAP/TAKTAKT To HacK THE yEaHHH AP TAP DaTaBaSE! l A (Tl TAKTIKTI TAK aND THERE WE Go WHOa, THIS LOOKS HARD NedroidPictureDiarybyAnthonyClark,http://nedroid.com Movies and tv shows always make hacking look exciting with furious typing and meaningless ones and zeros flying across the screen. They make hacking look like something that you have to be super smart to learn. They make hacking look like magic It's not magic It's based on computers, and everything computers do have logical principles behind them which can be learned and understood. Even when you dont understand or when the computer does something frustrating or mysterious, there is al ways lways, always a reason why And it's not hard to learn. This book assumes you know nothing about cryptography or programming, and helps you learn, step by step, how to write programs that can hack encrypted messages. Good luck and have fun 100% of the profits from this book are donated to the Electronic Frontier Foundation, the Creative Commons, and the tor project Dedicated to aaron swartz, 1986-2013 Aaron was part of an army of citizens that believes democracy only works when the citizenry are informed, when we know about our rights -and our obligations. an army that believes we must make justice and knowledge available to all--not just the well born or those that have grabbed the reins of power-so that we may govern ourselves more wisely When I see our army, I see Aaron Swartz and my heart is broken We have truly lost one of our better angels C M ABOUT THIS BOOK There are many books that teach beginners how to write secret messages using ciphers. There are a couple books that teach beginners how to hack ciphers. As far as I can tell, there are no books to teach beginners how to write programs to hack ciphers. This book fills that gap This book is for complete beginners who do not know anything about encryption, hacking, or cryptography. The ciphers in this book(except for the rsa cipher in the last chapter) are all centuries old, and modern computers now have the computational power to hack their encrypted messages. No modern organization or individuals use these ciphers anymore as such, there's no reasonable context in which you could get into legal trouble for the information in this book This book is for complete beginners who have never programmed before. This book teaches basic programming concepts with the Python programming language. Python is the best language for beginners to learn programming: it is simple and readable yet also a powerful programming language used by professional software developers. The Python software can be downloaded for freefromhttp://python.organdrunsonLinuxWindowsOsx,andtheRaspberryPi There are two definitions of"hacker. a hacker is a person who studies a system(such as the rules of a cipher or a piece of software) to understand it so well that they are not limited by the original rules of that system and can creatively modify it to work in new ways. "Hacker"is also used to mean criminals who break into computer systems, violate people's privacy, and cause damage. This book uses"hacker"in the first sense. Hackers are cool. Criminals are just people who think they're being clever by breaking stuff. Personally, my day job as a software developer pays me way more for less work than writing a virus or doing an Internet scam would On a side note, dont use any of the encryption programs in this book for your actual files Theyre fun to play with but they dont provide true security. And in general, you shouldnt trust the ciphers that you yourself make. As legendary cryptographer Bruce Schneier put it, Anyone from the most clueless amateur to the best cryptographer, can create an algorithm that he himself cant break. Its not even hard. What is hard is creating an algorithm that no one else can break, even after years of analysis. And the only way to prove that is to subject the algorithm to years of analysis by the best cryptographers around This book is released under a Creative Commons license and is free to copy and distribute(as long as you dont charge money for it). The book can be downloaded for free from its website at http:/inventwithpython.com/hacking.Ifyoueverhavequestionsabouthowtheseprogramswork feelfreetoemailmeatal@ainventwithpython.com TABLE OF CONTENTS About this book Table of contents Chapter 1 -Making Paper Cryptography Tools What is Cryptography? Codes vs Ciphers Making a Paper Cipher Wheel a Virtual Cipher wheel How to Encrypt with the Cipher Wheel 234789 How to Decrypt with the Cipher Wheel A Different Cipher Tool: The st. Cyr Slide……… 10 Practice Exercises, Chapter l, set A Doing Cryptography without Paper Tools..... 11 Practice Exercises, Chapter 1, set B .13 Double-Strength Encryption? 13 Programming a Computer to do encryption…… 14 Chapter2- Installing Python,………,…,,…,…,…,…,……,………16 Downloading and Installing Python 17 Downloading pyperclip py 18 Starting IDLE 18 The Featured Programs 19 Line numbers and spaces 20 Text Wrapping in This Book Tracing the Program Online 21 Checking Your Typed Code with the Online diff Tool 21 Copying and Pasting 21 Programming and Cryptography .22 Chapter 3-The Interactive Shell 26 Some simple math Stuff 26 Integers and Floating Point values .27 Expressions 27 Order of Operations 28 Evaluating Expressions……… Errors are Okay!....... 26 Practice Exercises, Chapter 3, Set A 30 Every value has a Data Type 30 Storing Values in Variables with Assignment Statements Overwriting variables 32 Using more Than One variable Variable names 34 Practice Exercises, Chapter 3, Set B Summary -But When Are we going to start hacking? 35 Chapter4 Strings and Writing Programs.…………………………36 Strings 36 String concatenation with the+ Operator…… 38 String Replication with the * Operator 39 Printing values with the print() function 39 Escape Characters…… Quotes and double Quotes Practice Exercises, Chapter 4, Set A 42 42 Negative Indexes. .43 Slie Blank slice indexes 45 Practice Exercises, Chapter 4, Set B Writing Programs in IDLE'S File editor Hello world! 47 Source code of hello world 47 Saving Your Program .47 Running your program 48 Opening The Programs Youve Saved 49 How the“ Hello world” Program Works Comments Functions The print ( function The input() function… 51 Ending the program Practice Exercises, Chapter 4, Set C 52 Summary… 52 Chapter5- The Reverse Cipher.…,…,……,……,……,…………53 The Reverse Cipher Source code of the reverse cipher program Sample run of the reverse Cipher Program Checking Your Source Code with the Online Diff Tool 455 How the Program Works... The len() Function Introducing the while 57 The Boolean Data Type .58 Comparison Operators 58 Conditions… Blocks The whi1 e Loop statement.……… 62 Growing” a String……………………… Tracing Through the Program, Step by Step……… 65 USing input( 67 Practice Exercises Chapter 5. section A .67 Summary 68 Chapter6· The Caesar Cipher.…,,…,…,…,…,…,…,…,…,…,…,…,…69 Implementing a Program Source Code of the Caesar Cipher Program 70 Sample run of the Caesar Cipher Program 71 Checking your Source Code with the online diff Tool .72 Practice Exercises, Chapter 6, Set A How the program Works Importing Modules with the import Statement 72 Constants 73 The upper()and1ower() String Methods…… 74 The for Loop statement…… 75 A while loop equivalent of a for loop 76 Practice Exercises, Chapter 6, Set B 77 The if statement 77 The else statement 78 The elif statement 78 The in and not in Operators 79 The find() String Method Practice Exercises, Chapter 6, Set C Back to the Code 81 Displaying and Copying the Encrypted/Decrypted String Encrypt Non-Letter Characters 84 Summar 85 Chapter 7-Hacking the Caesar Cipher with the Brute-Force Technique.ssssmemmmeemmmmeeee.87 Hacking ciphers .87 The Brute-Force Attack 88 Source Code of the Caesar Cipher Hacker Program 88 Sample run of the caesar cipher hacker program How the program Works The range() Function 0 Back to the Code String format Practice Exercises, Chapter 7, Set A ummary Chapter 8-Encrypting with the Transposition Cipher 95 Encrypting with the Transposition Cipher 95 Practice Exercises, Chapter 8, Set A 97 A Transposition Cipher Encryption Program ..97 Source Code of the Transposition Cipher Encryption Program .97 Sample run of the transposition Cipher Encryption Program 98 How the Program Works 99 Creating Your Own Functions with def Statements The Programs main() Function Parameters 101 Variables in the global and local Scope

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