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Cryptography and Message Authentication NS3

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Chapter3 Public-Key Cryptography and Message Authentication Henric Johnson Blekinge Institute of Technology, Sweden http://www.its.bth.se/staff/hjo/ [email_address]
OUTLINE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Authentication ,[object Object],[object Object],[object Object],[object Object],[object Object]
Approaches to Message Authentication ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
One-way HASH function
One-way HASH function ,[object Object]
Secure HASH Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Simple Hash Function ,[object Object]
Message Digest Generation Using SHA-1
SHA-1 Processing of single 512-Bit Block
Other Secure HASH functions 160 (5 paired rounds of 16) 64 (4 rounds of 16) 80 (4 rounds of 20) Number of steps 2 64 -1 bits Maximum message size 512 bits 512 bits 512 bits Basic unit of processing 160 bits 128 bits 160 bits Digest length RIPEMD-160 MD5 SHA-1
HMAC ,[object Object],[object Object],[object Object],[object Object],[object Object]
HMAC Structure
Public-Key Cryptography Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Encryption using Public-Key system
Authentication using Public-Key System
Applications for Public-Key Cryptosystems ,[object Object],[object Object],[object Object],[object Object]
Requirements for Public-Key Cryptography ,[object Object],[object Object],[object Object]
Requirements for Public-Key Cryptography ,[object Object],[object Object],[object Object]
Public-Key Cryptographic Algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The RSA Algorithm – Key Generation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example of RSA Algorithm
The RSA Algorithm - Encryption ,[object Object],[object Object]
The RSA Algorithm - Decryption ,[object Object],[object Object]
Diffie-Hellman Key Echange
Other Public-Key Cryptographic Algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Key Management Public-Key Certificate Use

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