Cns Chapter 2

Classical encryption techniques

Conventional Encryption Principles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conventional encryption requirements ,[object Object],[object Object],[object Object],[object Object],[object Object]

Conventional Encryption Principles

Cryptography ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Attacks on conventional encryption system ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Average time required for exhaustive key search 2.15 milliseconds 2 32 = 4.3 x 10 9 32 5.9 x 10 30 years 2 168 = 3.7 x 10 50 168 5.4 x 10 18 years 2 128 = 3.4 x 10 38 128 10 hours 2 56 = 7.2 x 10 16 56 Time required at 10 6 Decryption/ µs Number of Alternative Keys Key Size (bits)

Types of cryptanalysis ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Cns Chapter 2

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Cns Chapter 2