Symmetric-Key Cryptography CS 161: Computer Security Prof. Vern - - PowerPoint PPT Presentation

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symmetric key cryptography
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Symmetric-Key Cryptography CS 161: Computer Security Prof. Vern - - PowerPoint PPT Presentation

Jan 31, 2024 139 likes •293 views

Symmetric-Key Cryptography CS 161: Computer Security Prof. Vern Paxson TAs: Devdatta Akhawe, Mobin Javed & Matthias Vallentin http://inst.eecs.berkeley.edu/~cs161/ March 10, 2011 M 1 M 2 M 3 C 1 C 2 C 3 C 2 C 3 C 1 M 1 M 2 M 3 Original

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SLIDE 1

Symmetric-Key Cryptography

CS 161: Computer Security

  • Prof. Vern Paxson

TAs: Devdatta Akhawe, Mobin Javed & Matthias Vallentin

http://inst.eecs.berkeley.edu/~cs161/

March 10, 2011

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SLIDE 2
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SLIDE 3
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SLIDE 4
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SLIDE 5

M1 M2 M3 C1 C2 C3

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SLIDE 6

M1 M2 M3

C1 C2 C3

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SLIDE 7

Original image

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SLIDE 8

Encrypted with ECB

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SLIDE 9

M1 M2 M3

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SLIDE 10

M1 M2 M3

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SLIDE 11

Original image

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SLIDE 12

Encrypted with CBC

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SLIDE 13

(Nonce = Same as IV)

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SLIDE 14

(Note, uses block cipher’s encryption functionality, not decryption)