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Domain 5 – Cryptography

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Services Provided by Cryptography

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Cryptographic Definitions

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Cipher

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A Few More Definitions

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Need Some More Definitions?

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Symmetric Cryptography – Use of Secret Keys

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Historical Uses of Symmetric Cryptography – Hieroglyphics

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Scytale Cipher

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Substitution Ciphers

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Simple Substitution Cipher Atbash

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Simple Substitution Cipher Caesar Cipher

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Simple Substitution Cipher ROT13

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Historical Uses

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Polyalphabetic Cipher – Vigenere Cipher

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Polyalphabetic Substitution

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Vigenere Algorithm

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Enigma Machine

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U-Boats Had Enigma Machines

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Code Book

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Agenda 1

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Key and Algorithm Relationship

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Does Size Really Matter?

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Key Space

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Ways of Breaking Cryptosystems – Brute Force

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Brute Force Components

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Ways of Breaking Cryptosystems – Frequency Analysis

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Strength of a Cryptosystem

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Do You Know What You Are Doing?

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Developing Cryptographic Solutions In-House

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Characteristics of Strong Algorithms

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Open or Closed More Secure?

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Agenda 2

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Type of Symmetric Cipher – Block Cipher

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S-Boxes Used In Block Ciphers

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Binary Mathematical Function 1

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Type of Symmetric Cipher – Stream Cipher

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Symmetric Characteristics

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Initialization Vectors

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Security Holes

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Strength of a Stream Cipher

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Symmetric Key Cryptography

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Out-of-Band Transmission

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Symmetric Key Management Issue

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Symmetric Downfalls

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Why?

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Asymmetric Cryptography

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Key Functions

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Public Key Cryptography Advantages

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Asymmetric Algorithm Disadvantages

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Confusing Names

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Symmetric versus Asymmetric

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Questions 1

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When to Use Which Key

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Using the Algorithm Types Together

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Encryption Steps

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Receiver’s Public Key Is Used to Encrypt the Symmetric Key

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Receiver’s Private Key Is Used to Decrypt the Symmetric Key

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Digital Envelope

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Secret versus Session Keys

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Asymmetric Algorithms We Will Dive Into

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Asymmetric Algorithm – Diffie-Hellman

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Diffie-Hellman

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Key Agreement Schemes

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Asymmetric Algorithm – RSA

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Factoring Large Numbers

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RSA Operations

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RSA Key Size

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El Gamal

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ECC

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ECC Benefits

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Asymmetric Mathematics

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Asymmetric Security

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Mathematics

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Symmetric Ciphers We Will Dive Into

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Block Cipher

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Double DES

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Evolution of DES

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Modes of 3DES

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Encryption Modes

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Block Cipher Modes – CBC

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IV and CBC

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Different Modes of Block Ciphers – ECB

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ECB versus CBC

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Block Cipher Modes – CFB and OFB

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CFB and OFB Modes

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Counter Mode

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Modes Summary

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Symmetric Cipher – AES

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IDEA

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RC4 and RC5

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Agenda 3

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Data Integrity

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Hashing Steps

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Protecting the Integrity of Data

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Hashing Algorithms

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Data Integrity Mechanisms

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Hashing Strength

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Question 1

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More Protection in Data Integrity

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MAC

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HMAC – Sender

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HMAC – Receiver

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Another Look

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What Services

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Authentication Types

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Integrity?

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What Services?

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Question 2

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Digital Signatures

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One More Look 1

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U.S. Government Standard

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What Is…

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Zero Knowledge Proof

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Message Integrity Controls

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Security Issues In Hashing

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Example of a Birthday Attack

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Birthday Attack Issues

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Key Management

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Key Backup

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Key Management (Cont.)

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Key Usage

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Cryptoperiod

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M-of-N

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Key Types

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Agenda 4

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Components of PKI

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PKI

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PKI Steps

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RA Roles

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CA

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Let’s Walk Through an Example

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Digital Certificates

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Certificate

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Signing the Certificate

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Verifying the Certificate

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Trusted CA’s

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Non-Trusted CA

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One More Look 2

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What Do You Do with a Certificate?

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Components of PKI, Repository, and CRLs

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Revoked?

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CRL Process

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Different Uses for Certificates

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Cross Certification

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PKI and Trust

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Agenda 5

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Historical Uses of Symmetric Cryptography – Vernam Cipher

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Binary Mathematical Function 2

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One-Time Pad In Action

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One-Time Pad Characteristics

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Steganography

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Digital Watermarking

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Link versus End-to-End Encryption

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End-to-End Encryption

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Encryption Location

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Email Standards

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You Decide

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Non-Hierarchical

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Secure Protocols

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SSL Connection Setup

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Example – SSL

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Validating Certificate

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Secure Protocols (Cont.)

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SSL and the OSI Model

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E-Commerce

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How Are You Doing?

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Hard the First Times Through

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Secure Email Standard

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Agenda 6

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IPSec Key Management

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IPSec Handshaking Process

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VPN Establishment

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SAs in Use

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Key Issues Within IPSec

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Configuration of SA Parameters

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IPSec Configuration Options

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IPSec Is a Suite of Protocols

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AH and ESP Modes

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IPSec Modes of Operation

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VPN Establishment (Cont.)

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Review

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Questions 2

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Attack Types

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Attacks on Cryptosystems

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Known-Plaintext Attack

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Chosen-Plaintext Attack

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Chosen-Ciphertext Attack

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Adaptive Attacks

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Side Channel Attacks

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Domain 5 Review