Hacking Secret Ciphers with Python Ebook Pdf

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Download Hacking Secret Ciphers with Python Ebook Pdf - 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!


Judul buku: Hacking Secret Ciphers with Python
Bahasa: Inggris
Tebal: 442 halaman
Format buku: Pdf
Software: Sumatra Pdf Reader
Ukuran: 3.7MiB

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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  
• How to Decrypt with the Cipher Wheel 
• A Different Cipher Tool: The St. Cyr Slide  
• Practice Exercises, Chapter 1, Set A 
• Doing Cryptography without Paper Tools  
• Practice Exercises, Chapter 1, Set B 
• Double-Strength Encryption? 
• Programming a Computer to do Encryption 

Chapter 2 - Installing Python

• Downloading and Installing Python 
• Downloading pyperclip.py 
• Starting IDLE 
• The Featured Programs 
• Line Numbers and Spaces 
• Text Wrapping in This Book 
• Tracing the Program Online 
• Checking Your Typed Code with the Online Diff Tool 
• Copying and Pasting Text 
• More Info Links 
• Programming and Cryptography 

Chapter 3 - The Interactive Shell

• Some Simple Math Stuff 
• Integers and Floating Point Values 
• Expressions 
• Order of Operations 
• Evaluating Expressions 
• Errors are Okay! 
• Practice Exercises, Chapter 3, Set A 
• Every Value has a Data Type 
• Storing Values in Variables with Assignment Statements 
• Overwriting Variables 
• Using More Than One Variable 
• Variable Names 
• Practice Exercises, Chapter 3, Set B  
• Summary - But When Are We Going to Start Hacking?

Chapter 4 - Strings and Writing Programs

• Strings 
• String Concatenation with the + Operator 
• String Replication with the * Operator
• Printing Values with the print() Function 
• Escape Characters 
• Quotes and Double Quotes 
• Practice Exercises, Chapter 4, Set A 
• Indexing 
• Negative Indexes 
• Slicing 
• Blank Slice Indexes 
• Practice Exercises, Chapter 4, Set B 
• Writing Programs in IDLE’s File Editor 
• Hello World! 
• Source Code of Hello World
• Saving Your Program 
• Running Your Program 
• Opening The Programs You’ve Saved 
• How the “Hello World” Program Works 
• Comments 
• Functions
• The print() function 
• The input() function 
• Ending the Program 
• Practice Exercises, Chapter 4, Set C 
• Summary

Chapter 5 - The Reverse Cipher

• 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 
• How the Program Works
• The len() Function 
• Introducing the while Loop 
• The Boolean Data Type 
• Comparison Operators 
• Conditions 
• Blocks 
• The while Loop Statement 
• “Growing” a String 
• Tracing Through the Program, Step by Step 
• Using input() In Our Programs 
• Practice Exercises, Chapter 5, Section A 
• Summary

Chapter 6 - The Caesar Cipher

• Implementing a Program 
• Source Code of the Caesar Cipher Program 
• Sample Run of the Caesar Cipher Program 
• Checking Your Source Code with the Online Diff Tool 
• Practice Exercises, Chapter 6, Set A 
• How the Program Works 
• Importing Modules with the import Statement 
• Constants 
• The upper() and lower() String Methods 
• The for Loop Statement 
• A while Loop Equivalent of a for Loop 
• Practice Exercises, Chapter 6, Set B 
• The if Statement 
• The else Statement 
• The elif Statement 
• The in and not in Operators 
• The find() String Method 
• Practice Exercises, Chapter 6, Set C 
• Back to the Code 
• Displaying and Copying the Encrypted/Decrypted String 
• Encrypt Non-Letter Characters 
• Summary

Chapter 7 - Hacking the Caesar Cipher with the Brute-Force Technique

• Hacking Ciphers 
• The Brute-Force Attack 
• Source Code of the Caesar Cipher Hacker Program 
• Sample Run of the Caesar Cipher Hacker Program 
• How the Program Works. 
• The range() Function 
• Back to the Code 
• String Formatting 
• Practice Exercises, Chapter 7, Set A 
• Summary

Chapter 8 - Encrypting with the Transposition Cipher

• Encrypting with the Transposition Cipher 
• Practice Exercises, Chapter 8, Set A 
• A Transposition Cipher Encryption Program 
• Source Code of the Transposition Cipher Encryption Program 
• Sample Run of the Transposition Cipher Encryption Program 
• How the Program Works 
• Creating Your Own Functions with def Statements 
• The Program’s main() Function 
• Parameters 
• Variables in the Global and Local Scope 
• The global Statement 
• Practice Exercises, Chapter 8, Set B 
• The List Data Type 
• Using the list() Function to Convert Range Objects to Lists 
• Reassigning the Items in Lists 
• Reassigning Characters in Strings 
• Lists of Lists 
• Practice Exercises, Chapter 8, Set C 
• Using len() and the in Operator with Lists 
• List Concatenation and Replication with the + and * Operators 
• Practice Exercises, Chapter 8, Set D 
• The Transposition Encryption Algorithm 
• Augmented Assignment Operators 
• Back to the Code 
• The join() String Method 
• Return Values and return Statements 
• Practice Exercises, Chapter 8, Set E 
• Back to the Code 
• The Special __name__ Variable 
• Key Size and Message Length
• Summary

Chapter 9 - Decrypting with the Transposition Cipher

• Decrypting with the Transposition Cipher on Paper 
• Practice Exercises, Chapter 9, Set A 
• A Transposition Cipher Decryption Program 
• Source Code of the Transposition Cipher Decryption Program 
• How the Program Works 
• The math.ceil(), math.floor() and round() Functions 
• The and and or Boolean Operators 
• Practice Exercises, Chapter 9, Set B 
• Truth Tables 
• The and and or Operators are Shortcuts 
• Order of Operations for Boolean Operators 
• Back to the Code 
• Practice Exercises, Chapter 9, Set C 
• Summary

Chapter 10 - Programming a Program to Test Our Program

• Source Code of the Transposition Cipher Tester Program 
• Sample Run of the Transposition Cipher Tester Program 
• How the Program Works 
• Pseudorandom Numbers and the random.seed() Function 
• The random.randint() Function 
• References 
• The copy.deepcopy() Functions 
• Practice Exercises, Chapter 10, Set A 
• The random.shuffle() Function 
• Randomly Scrambling a String 
• Back to the Code 
• The sys.exit() Function 
• Testing Our Test Program 
• Summary

Chapter 11 - Encrypting and Decrypting Files

• Plain Text Files 
• Source Code of the Transposition File Cipher Program 
• Sample Run of the Transposition File Cipher Program 
• Reading From Files 
• Writing To Files 
• How the Program Works 
• The os.path.exists() Function 
• The startswith() and endswith() String Methods 
• The title() String Method 
• The time Module and time.time() Function 
• Back to the Code 
• Practice Exercises, Chapter 11, Set A 
• Summary

Chapter 12 - Detecting English Programmatically

• How Can a Computer Understand English? 
• Practice Exercises, Chapter 12, Section A 
• The Detect English Module 
• Source Code for the Detect English Module 
• How the Program Works 
• Dictionaries and the Dictionary Data Type 
• Adding or Changing Items in a Dictionary 
• Practice Exercises, Chapter 12, Set B 
• Using the len() Function with Dictionaries 
• Using the in Operator with Dictionaries 
• Using for Loops with Dictionaries 
• Practice Exercises, Chapter 12, Set C 
• The Difference Between Dictionaries and Lists 
• Finding Items is Faster with Dictionaries Than Lists 
• The split() Method 
• The None Value 
• Back to the Code 
• “Divide by Zero” Errors 
• The float(), int(), and str() Functions and Integer Division 
• Practice Exercises, Chapter 12, Set D 
• Back to the Code 
• The append() List Method 
• Default Arguments 
• Calculating Percentage 
• Practice Exercises, Chapter 12, Set E 
• Summary

Chapter 13 - Hacking the Transposition Cipher

• Source Code of the Transposition Cipher Hacker Program 
• Sample Run of the Transposition Breaker Program 
• How the Program Works 
• Multi-line Strings with Triple Quotes 
• Back to the Code 
• The strip() String Method 
• Practice Exercises, Chapter 13, Set 
• Summary

Chapter 14 - Modular Arithmetic with the Multiplicative and Affine Ciphers

• Oh No Math! 
• Math Oh Yeah! 
• Modular Arithmetic (aka Clock Arithmetic) 
• The % Mod Operator 
• Practice Exercises, Chapter 14, Set A 
• GCD: Greatest Common Divisor (aka Greatest Common Factor) 
• Visualize Factors and GCD with Cuisenaire Rods 
• Practice Exercises, Chapter 14, Set B 
• Multiple Assignment 
• Swapping Values with the Multiple Assignment Trick 
• Euclid’s Algorithm for Finding the GCD of Two Numbers 
• “Relatively Prime” 
• Practice Exercises, Chapter 14, Set C 
• The Multiplicative Cipher 
• Practice Exercises, Chapter 14, Set D 
• Multiplicative Cipher + Caesar Cipher = The Affine Cipher 
• The First Affine Key Problem 
• Decrypting with the Affine Cipher 
• Finding Modular Inverses 
• The // Integer Division Operator 
• Source Code of the cryptomath Module 
• Practice Exercises, Chapter 14, Set E 
• Summary

Chapter 15 - The Affine Cipher

• Source Code of the Affine Cipher Program 
• Sample Run of the Affine Cipher Program 
• Practice Exercises, Chapter 15, Set A 
• How the Program Works 
• Splitting One Key into Two Keys 
• The Tuple Data Type 
• Input Validation on the Keys 
• The Affine Cipher Encryption Function 
• The Affine Cipher Decryption Function 
• Generating Random Keys 
• The Second Affine Key Problem: How Many Keys Can the Affine Cipher Have? 
• Summary

Chapter 16 - Hacking the Affine Cipher

• Source Code of the Affine Cipher Hacker Program 
• Sample Run of the Affine Cipher Hacker Program 
• How the Program Works 
• The Affine Cipher Hacking Function 
• The ** Exponent Operator 
• The continue Statement 
• Practice Exercises, Chapter 16, Set A 
• Summary

Chapter 17 - The Simple Substitution Cipher

• The Simple Substitution Cipher with Paper and Pencil 
• Practice Exercises, Chapter 17, Set A 
• Source Code of the Simple Substitution Cipher
• Sample Run of the Simple Substitution Cipher Program 
• How the Program Works 
• The Program’s main() Function 
• The sort() List Method 
• Wrapper Functions 
• The Program’s translateMessage() Function 
• The isupper() and islower() String Methods 
• Practice Exercises, Chapter 17, Set B 
• Generating a Random Key 
• Encrypting Spaces and Punctuation 
• Practice Exercises, Chapter 17, Set C 
• Summary

Chapter 18 - Hacking the Simple Substitution Cipher

• Computing Word Patterns 
• Getting a List of Candidates for a Cipherword 
• Practice Exercises, Chapter 18, Set 
• Source Code of the Word Pattern Module 
• Sample Run of the Word Pattern Module 
• How the Program Works 
• The pprint.pprint() and pprint.pformat() Functions 
• Building Strings in Python with Lists 
• Calculating the Word Pattern 
• The Word Pattern Program’s main() Function 
• Hacking the Simple Substitution Cipher 
• Source Code of the Simple Substitution Hacking Program 
• Hacking the Simple Substitution Cipher (in Theory) 
• Explore the Hacking Functions with the Interactive Shell 
• How the Program Works 
• Import All the Things 
• A Brief Intro to Regular Expressions and the sub() Regex Method 
• The Hacking Program’s main() Function 
• Partially Hacking the Cipher 
• Blank Cipherletter Mappings 
• Adding Letters to a Cipherletter Mapping 
• Intersecting Two Letter Mappings 
• Removing Solved Letters from the Letter Mapping 
• Hacking the Simple Substitution Cipher
• Creating a Key from a Letter Mapping 
• Couldn’t We Just Encrypt the Spaces Too? 
• Summary

Chapter 19 - The Vigenère Cipher

• Le Chiffre Indéchiffrable 
• Multiple “Keys” in the Vigenère Key 
• Source Code of Vigenère Cipher Program 
• Sample Run of the Vigenère Cipher Program 
• How the Program Works 
• Summary

Chapter 20 - Frequency Analysis

• The Code for Matching Letter Frequencies 
• How the Program Works 
• The Most Common Letters, “ETAOIN” 
• The Program’s getLettersCount() Function 
• The Program’s getItemAtIndexZero() Function 
• The Program’s getFrequencyOrder() Function 
• The sort() Method’s key and reverse Keyword Arguments 
• Passing Functions as Values 
• Converting Dictionaries to Lists with the keys(), values(), items() Dictionary Methods 
• Sorting the Items from a Dictionary 
• The Program’s englishFreqMatchScore() Function 
• Summary

Chapter 21 - Hacking the Vigenère Cipher

• The Dictionary Attack 
• Source Code for a Vigenère Dictionary Attack Program 
• Sample Run of the Vigenère Dictionary Hacker Program 
• The readlines() File Object Method 
• The Babbage Attack & Kasiski Examination 
• Kasiski Examination, Step 1 – Find Repeat Sequences’ Spacings 
• Kasiski Examination, Step 2 – Get Factors of Spacings 
• Get Every Nth Letters from a String 
• Frequency Analysis 
• Brute-Force through the Possible Keys 
• Source Code for the Vigenère Hacking Program 
• Sample Run of the Vigenère Hacking Program 
• How the Program Works 
• Finding Repeated Sequences 
• Calculating Factors 
• Removing Duplicates with the set() Function 
• The Kasiski Examination Algorithm 
• The extend() List Method 
• The end Keyword Argument for print() 
• The itertools.product() Function 
• The break Statement 
• Practice Exercises, Chapter 21, Set A 
• Modifying the Constants of the Hacking Program 
• Summary

Chapter 22 - The One-Time Pad Cipher

• The Unbreakable One-Time Pad Cipher 
• Why the One-Time Pad is Unbreakable 
• Beware Pseudorandomness 
• Beware the Two-Time Pad 
• The Two-Time Pad is the Vigenère Cipher 
• Practice Exercises, Chapter 22, Set A 
• Summary

Chapter 23 - Finding Prime Numbers

• Prime Numbers 
• Composite Numbers 
• Source Code for The Prime Sieve Module 
• How the Program Works 
• How to Calculate if a Number is Prime 
• The Sieve of Eratosthenes 
• The primeSieve() Function 
• Detecting Prime Numbers 
• Source Code for the Rabin-Miller Module 
• Sample Run of the Rabin Miller Module 
• How the Program Works
• The Rabin-Miller Primality Algorithm 
• The New and Improved isPrime() Function 
• Summary

Chapter 24 - Public Key Cryptography and the RSA Cipher

• Public Key Cryptography 
• The Dangers of “Textbook” RSA 
• A Note About Authentication 
• The Man-In-The-Middle Attack 
• Generating Public and Private Keys 
• Source Code for the RSA Key Generation Program 
• Sample Run of the RSA Key Generation Program 
• How the Key Generation Program Works 
• The Program’s generateKey() Function 
• RSA Key File Format 
• Hybrid Cryptosystems 
• Source Code for the RSA Cipher Program 
• Sample Run of the RSA Cipher Program 
• Practice Exercises, Chapter 24, Set A 
• Digital Signatures 
• How the RSA Cipher Program Works 
• ASCII: Using Numbers to Represent Characters 
• The chr() and ord() Functions 
• Practice Exercises, Chapter 24, Set B 
• Blocks 
• Converting Strings to Blocks with getBlocksFromText() 
• The encode() String Method and the Bytes Data Type 
• The bytes() Function and decode() Bytes Method 
• Practice Exercises, Chapter 24, Set C 
• Back to the Code 
• The min() and max() Functions 
• The insert() List Method 
• The Mathematics of RSA Encrypting and Decrypting 
• The pow() Function 
• Reading in the Public & Private Keys from their Key Files 
• The Full RSA Encryption Process 
• The Full RSA Decryption Process 
• Practice Exercises, Chapter 24, Set D 
• Why Can’t We Hack the RSA Cipher 
• Summary

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