Lecture 1

• 15-827 Security and Cryptography Lecture 1 .
• Outline .
• Overview of Cryptography and Security: Building Blocks and Layers .
• Physical Security Risks: Natural and Malicious .
• Malicious Attacks .
• More Malicious Attacks .
• More Malicious Attacks .
• More Malicious Attacks .
• More Malicious Attacks .
• Principles Behind Physical Security .
• Risk Analysis: Simplistic Example (from Rivest'95) .
• Risk Analysis (Simplistic Example) .
• Risk Analysis (Simplistic Example) .
• Cryptography Basics .
• Cryptology .
• Cryptosystem (pictorially) .
• What's Secret? .
• Desired goals for A wants to send B a message M. .
• Security Metrics .
• Kinds of Cryptoanalysis Attacks .
• Unconditional security (against ciphertext -only attacks) .
• Example: One-Time Pad .
• More on One-Time Pads .
• Unconditional Authenticity .
• Unconditional Authenticity ( cont'd ) .
• Concrete Example .
• Computational Security .
• DES .
• DES criticisms and realities .
• DES .
• Can we strengthen DES? .
• Can We Strengthen DES? .
• DES properties ( pp . 256-258) .
• Cryptanalysis of DES .
• What About Those S-Boxes? .
• Block Cipher Modes of Operation (Section 7.2.2) .
• Electronic Codebook Mode (ECB) .
• Cipher Block Chaining (CBC) .
• Cipher Feedback (CFB) and Output Feedback (OFB) Modes .
• Modes of Operation Depicted .
• Other Block Ciphers .
• Next Time .

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Heather L. Marko
Last Modified: September 1998