Nov20 - CSE/ECE404 Computer Networks Instructor Dr Liang...

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CSE/ECE404: Computer Networks Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University November 20, 2007
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/20/07 Outline Recap (Chapter 6) Cryptographic algorithms (Chapter 8) Summary
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/20/07 Outline Recap Cryptographic algorithms Summary
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/20/07 Overview Security Cryptography algorithms Public key (e.g., RSA) Secret key (e.g., DES) Hashing (e.g., MD5) Security services Authentication Privacy Message integrity
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/20/07 Data Encryption Standard DES: Confusion and diffusion 64-bit block of plaintext 64-bit key (56-bits + 8-bit parity) 16 rounds 32 bits 32 bits 48 bits Initial permutation Round 1 Round 2 Round 16 56-bit key Final permutation + F L i– 1 R i– 1 R i K i L i
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/20/07
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