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Chapter 10: Cipher Techniques Slide #10 -1 Chapter 10: Cipher Techniques Slide #10 -1

Overview Slide #10 -2 Overview Slide #10 -2

Problems Slide #10 -3 Problems Slide #10 -3

Attack #1: Precomputation Slide #10 -4 Attack #1: Precomputation Slide #10 -4

Example Slide #10 -5 Example Slide #10 -5

May Not Be Obvious Slide #10 -6 May Not Be Obvious Slide #10 -6

Misordered Blocks Slide #10 -7 Misordered Blocks Slide #10 -7

Notes Slide #10 -8 Notes Slide #10 -8

Statistical Regularities Slide #10 -9 Statistical Regularities Slide #10 -9

What These Mean Slide #10 -10 What These Mean Slide #10 -10

Stream, Block Ciphers Slide #10 -11 Stream, Block Ciphers Slide #10 -11

Examples Slide #10 -12 Examples Slide #10 -12

Stream Ciphers Slide #10 -13 Stream Ciphers Slide #10 -13

Synchronous Stream Ciphers Slide #10 -14 Synchronous Stream Ciphers Slide #10 -14

Operation Slide #10 -15 Operation Slide #10 -15

Example Slide #10 -16 Example Slide #10 -16

NLFSR Slide #10 -17 NLFSR Slide #10 -17

Example Slide #10 -18 Example Slide #10 -18

Eliminating Linearity Slide #10 -19 Eliminating Linearity Slide #10 -19

Self-Synchronous Stream Cipher Slide #10 -20 Self-Synchronous Stream Cipher Slide #10 -20

Another Example Slide #10 -21 Another Example Slide #10 -21

Variant Slide #10 -22 Variant Slide #10 -22

Block Ciphers Slide #10 -23 Block Ciphers Slide #10 -23

Solutions Slide #10 -24 Solutions Slide #10 -24

Multiple Encryption Slide #10 -25 Multiple Encryption Slide #10 -25

Networks and Cryptography Slide #10 -26 Networks and Cryptography Slide #10 -26

Link and End-to-End Protocols Slide #10 -27 Link and End-to-End Protocols Slide #10 -27

Encryption Slide #10 -28 Encryption Slide #10 -28

Examples Slide #10 -29 Examples Slide #10 -29

Cryptographic Considerations Slide #10 -30 Cryptographic Considerations Slide #10 -30

Traffic Analysis Slide #10 -31 Traffic Analysis Slide #10 -31

Example Protocols Slide #10 -32 Example Protocols Slide #10 -32

Goals of PEM Slide #10 -33 Goals of PEM Slide #10 -33

Message Handling System Slide #10 -34 Message Handling System Slide #10 -34

Design Principles Slide #10 -35 Design Principles Slide #10 -35

Basic Design: Keys Slide #10 -36 Basic Design: Keys Slide #10 -36

Basic Design: Sending Slide #10 -37 Basic Design: Sending Slide #10 -37

Basic Design: Integrity Slide #10 -38 Basic Design: Integrity Slide #10 -38

Basic Design: Everything Slide #10 -39 Basic Design: Everything Slide #10 -39

Practical Considerations Slide #10 -40 Practical Considerations Slide #10 -40

Problem Slide #10 -41 Problem Slide #10 -41

PEM vs. PGP Slide #10 -42 PEM vs. PGP Slide #10 -42

IPsec Slide #10 -43 IPsec Slide #10 -43

IPsec Transport Mode Slide #10 -44 IPsec Transport Mode Slide #10 -44

IPsec Tunnel Mode Slide #10 -45 IPsec Tunnel Mode Slide #10 -45

IPsec Protocols Slide #10 -46 IPsec Protocols Slide #10 -46

IPsec Architecture Slide #10 -47 IPsec Architecture Slide #10 -47

Example Slide #10 -48 Example Slide #10 -48

IPsec Architecture Slide #10 -49 IPsec Architecture Slide #10 -49

SA Database (SAD) Slide #10 -50 SA Database (SAD) Slide #10 -50

SAD Fields Slide #10 -51 SAD Fields Slide #10 -51

IPsec Architecture Slide #10 -52 IPsec Architecture Slide #10 -52

SA Bundles and Nesting Slide #10 -53 SA Bundles and Nesting Slide #10 -53

Example: Nested Tunnels Slide #10 -54 Example: Nested Tunnels Slide #10 -54

Example: Systems Slide #10 -55 Example: Systems Slide #10 -55

Example: Packets Slide #10 -56 Example: Packets Slide #10 -56

AH Protocol Slide #10 -57 AH Protocol Slide #10 -57

Sender Slide #10 -58 Sender Slide #10 -58

Recipient Slide #10 -59 Recipient Slide #10 -59

Recipient, Using Antireplay Slide #10 -60 Recipient, Using Antireplay Slide #10 -60

AH Miscellany Slide #10 -61 AH Miscellany Slide #10 -61

ESP Protocol Slide #10 -62 ESP Protocol Slide #10 -62

Sender Slide #10 -63 Sender Slide #10 -63

Recipient Slide #10 -64 Recipient Slide #10 -64

Recipient Slide #10 -65 Recipient Slide #10 -65

ESP Miscellany Slide #10 -66 ESP Miscellany Slide #10 -66

More ESP Miscellany Slide #10 -67 More ESP Miscellany Slide #10 -67

Which to Use: PEM, IPsec Slide #10 -68 Which to Use: PEM, IPsec Slide #10 -68

Key Points Slide #10 -69 Key Points Slide #10 -69