tailieunhanh - Cryptography

Cryptography – science of encrypting information. “scrambles” data so only authorized parties can “unscramble” and read data Can substitute Can transpose Visual next slide | Security+ All-In-One Edition Chapter 4 – Cryptography Brian E. Brzezicki Cryptography Cryptography – science of encrypting information. “scrambles” data so only authorized parties can “unscramble” and read data Can substitute Can transpose Visual next slide Basic Idea Cryptographic Terminology Cryptography - a method of storing and transmitting data in a form only intended for authorized parties to read or process. Cryptanalysis* - science of studying, breaking, and reverse engineering algorithms and keys. (more) Cryptographic Terminology Encryption – the method of transforming data (plaintext) into an unreadable format. Plaintext – the format (usually readable) of data before being encrypted Cipher text – the “Scrambled” format of data after being encrypted (more) Cryptographic Terminology Decryption – the method of turning cipher text back into Encryption algorithm – a set or rules or procedures that dictates how to encrypt and decrypt data. Also called an encryption “cipher” Key – | Security+ All-In-One Edition Chapter 4 – Cryptography Brian E. Brzezicki Cryptography Cryptography – science of encrypting information. “scrambles” data so only authorized parties can “unscramble” and read data Can substitute Can transpose Visual next slide Basic Idea Cryptographic Terminology Cryptography - a method of storing and transmitting data in a form only intended for authorized parties to read or process. Cryptanalysis* - science of studying, breaking, and reverse engineering algorithms and keys. (more) Cryptographic Terminology Encryption – the method of transforming data (plaintext) into an unreadable format. Plaintext – the format (usually readable) of data before being encrypted Cipher text – the “Scrambled” format of data after being encrypted (more) Cryptographic Terminology Decryption – the method of turning cipher text back into Encryption algorithm – a set or rules or procedures that dictates how to encrypt and decrypt data. Also called an encryption “cipher” Key – (crypto variable) a values used in the encryption process to encrypt and decrypt (more) Cryptosystem Definitions (670) Key space – the range of possible values used to construct keys Key Clustering – Instance when two different keys generate the same cipher text from the same plaintext Work factor – estimated time and resources to break a cryptosystem Cryptography History Romans used a shift cipher called a “CEASAR” cipher. Shift Ciphers simply shift characters in an alphabet. (visual on next slide) ROT13 / shift cipher Go to to try Transposition Cipher Jumbles up the ordering of characters in a message. The Spartans of Greece used a form of this called the “Scytale” Cipher. (visual on next page) Scytale Vigenere Cipher Polyalphabetic Substitution Cipher – A more advanced substitution cipher as it any letter can have multiple letters substituted for it! That is an A will not always map to an N Harder to break! Visual next slide Vigenere Cipher Question So far which

• An ninh - Bảo mật
• Cryptography
• Security
• General Security Concepts
• Security Concepts
• network security
• computer network security
• key cryptography
• tài liệu key cryptography
• tìm hiểu key cryptography
• ứng dụng với key cryptography
• tài liệu về mật mã
• Lecture Cryptography and network security
• Cryptography and network security
• Mathematics of Cryptography
• Algebraic Structures
• Cryptography requires
• Cryptography & Network Security
• Cryptography & Network Security Exercise
• Java Cryptography Architecture
• Understand the JCE
• ava Cryptography Extension
• Java Crypto API’s
• Review Cryptography & Network Security
• Basics of Cryptography
• Network Security Applications
• System Security
• Security service
• Cryptography engineering
• The context of cryptography
• Introduction to cryptography
• Block ciphers
• Block cipher modes
• Hash functions
• Message authentication codes
• Introduction to modern cryptography
• Modern cryptography
• Classical cryptography
• Perfectly secret encryption
• Practical constructions
• Cryptography theory and practice
• Cryptography theory
• Bit generation in cryptography
• Key establishment including
• Key distribution
• Modular Arithmetic
• Integer arithmetic
• Integer Division
• Congruence Equations
• Cardinality of Primes
• Generating Primes
• Symmetric Key Cryptography
• Knapsack Cryptosystem
• Trapdoor One Way Function
• Security of the Rabin System
• Midterm Review Cryptography & Network Security
• OSI Security Architecture
• Security Attack
• Security mechanism
• Principles Cryptography
• Practice Cryptography
• William Stallings
• An ninh mạng
• Bảo mật mạng
• Authentication protocols
• The real world
• Public key cryptography
• Strong security definiti
• Network Security Fundamentals
• Guide to Network Security Fundamentals
• Information security
• Scrambling through cryptography
• Cryptography hashing algorithms
• Symmetric encryption algorithms
• Introduction data Security
• Stream Ciphers
• The Advanced Encryption Standard
• Internal Structure of AES
• Introduction to Public Key Cryptography
• The RSA Cryptosystem
• An Introduction to Cryptography
• Second Edition
• Mathematical Basics
• Cryptographic Basics
• Primality Testing
• Cryptographic hardness assumptions
• Computing discrete logarithms
• The public key revolution
• Digital signature schemes
• Methods of public key cryptography
• Diffie hellman key exchange
• Elgamal protocol
• Rsa cryptosystem
• Elliptic and hyperelliptic curve cryptography
• Hyperelliptic curve cryptography
• Cohomological background on point counting
• Background on pairings
• Background on weil descent
• Attacks Threatening Availability
• Denial of service
• Security Services
• Traditional Symmetric Key Ciphers
• Kerckhoff’s Principle
• Polyalphabetic Ciphers
• Monoalphabetic Ciphers
• Symmetric key Ciphers
• Modern block cipher
• Feistel Ciphers
• Data Encryption Standard
• Encryption process
• General structure of DES
• Reverse Cipher
• Advanced Encryption Standard
• Structure of Each Round
• Key Expansion Analysis
• Modern Symmetric Key Ciphers
• Electronic Codebook
• Cipher Block Chaining
• Cipher Feedback