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Cryptography Introduction

Cryptography Introduction. Prof. Ravi Sandhu. CRYPTOGRAPHIC TECHNOLOGY. SECRET KEY Symmetric Key Single Key Conventional. PUBLIC KEY Asymmetric Key Two Key. CRYPTOGRAPHIC TECHNOLOGY. Secret-key encryption Public-key encryption Public-key digital signatures Public-key key agreement

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Cryptography Introduction

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  1. Cryptography Introduction Prof. Ravi Sandhu

  2. CRYPTOGRAPHIC TECHNOLOGY SECRET KEY Symmetric Key Single Key Conventional PUBLIC KEY Asymmetric Key Two Key

  3. CRYPTOGRAPHIC TECHNOLOGY • Secret-key encryption • Public-key encryption • Public-key digital signatures • Public-key key agreement • Message digests • Message authentication codes • Challenge-response authentication • Public-key certificates

  4. CRYPTOGRAPHICSERVICES • confidentiality • traffic flow confidentiality • integrity • authentication • non-repudiation

  5. SAFE CRYPTOGRAPHY • Secret-key encryption • 128 bit or higher • Public-key • 1024 bit or higher • Message digests • 160 bit or higher • These numbers keep increasing

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