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Ch03

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Joe Christensen
Joe Christensen
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Cryptography and Network Security Third Edition by William Stallings Lecture slides by Lawrie Brown
Chapter 3 – Block Ciphers and the Data Encryption Standard ,[object Object],[object Object]
Modern Block Ciphers ,[object Object],[object Object],[object Object],[object Object]
Block vs Stream Ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Block Cipher Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Claude Shannon and Substitution-Permutation Ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Confusion and Diffusion ,[object Object],[object Object],[object Object],[object Object],[object Object]
Feistel Cipher Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Feistel Cipher Structure
Feistel Cipher Design Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Feistel Cipher Decryption
Data Encryption Standard (DES) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES History ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES Design Controversy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES Encryption
Initial Permutation IP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES Round Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES Round Structure
Substitution Boxes S ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES Key Schedule ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DES Decryption ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Avalanche Effect ,[object Object],[object Object],[object Object],[object Object]
Strength of DES – Key Size ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Strength of DES – Timing Attacks ,[object Object],[object Object],[object Object],[object Object]
Strength of DES – Analytic Attacks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Differential Cryptanalysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Differential Cryptanalysis ,[object Object],[object Object],[object Object],[object Object],[object Object]
Differential Cryptanalysis Compares Pairs of Encryptions ,[object Object],[object Object],[object Object]
Differential Cryptanalysis ,[object Object],[object Object],[object Object],[object Object]
Differential Cryptanalysis
Differential Cryptanalysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Linear Cryptanalysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Linear Cryptanalysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Block Cipher Design Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Modes of Operation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Electronic Codebook Book (ECB) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Electronic Codebook Book (ECB)
Advantages and Limitations of ECB ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cipher Block Chaining (CBC) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cipher Block Chaining (CBC)
Advantages and Limitations of CBC ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cipher FeedBack (CFB) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cipher FeedBack (CFB)
Advantages and Limitations of CFB ,[object Object],[object Object],[object Object],[object Object],[object Object]
Output FeedBack (OFB) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Output FeedBack (OFB)
Advantages and Limitations of OFB ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Counter (CTR) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Counter (CTR)
Advantages and Limitations of CTR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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