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Conventional Encryption NS2

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Chapter 2 Conventional Encryption Message Confidentiality 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]
Conventional Encryption Principles ,[object Object],[object Object],[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]
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)
Feistel Cipher Structure ,[object Object],[object Object]
Feistel Cipher Structure ,[object Object],[object Object],[object Object],[object Object],[object Object]
 
Conventional Encryption Algorithms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
 
DES ,[object Object],[object Object],[object Object],[object Object],[object Object]
Time to break a code (10 6 decryptions/µs)
Triple DEA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],C = E K3 [D K2 [E K1 [P]]]
Triple DEA
Other Symmetric Block Ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Other Symmetric Block Ciphers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cipher Block Modes of Operation ,[object Object],[object Object],[object Object]
 
Location of Encryption Device ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
Key Distribution ,[object Object],[object Object],[object Object],[object Object]
Key Distribution (See Figure 2.10) ,[object Object],[object Object],[object Object],[object Object]
 
Recommended Reading ,[object Object],[object Object],[object Object]

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Conventional Encryption NS2

  • 1. Chapter 2 Conventional Encryption Message Confidentiality Henric Johnson Blekinge Institute of Technology, Sweden http://www.its.bth.se/staff/hjo/ [email_address]
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  • 6. 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)
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  • 14. Time to break a code (10 6 decryptions/µs)
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