Cryptographic Protocols

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Cryptographic Protocols

• Entity Authentication
• Key Agreement
• Fiat-Shamir Identification Schemes
• Zero-Knowledge Proof Systems
• Shnorrs Identification/Signature Scheme
• Commitment Schemes
• Secret Sharing
• Electronic Election

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Entity Authentication

• Problem Alice wants to prove to Bob
• that she is Alice and/or vice versa.
• Private-key based schemes
• Public-key based schemes
• Integrated with key agreement
• Zero-knowledge identification schemes

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Key Agreement/Distribution
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Identification Schemes

• based on zero-knowledge
• interactive proof systems

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Zero-Knowledge Proof Systems
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Shnorrs Identification Scheme

• Another example of zero-knowledge
• interactive proof system
• Proof of knowledge of discrete logarithm

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Commitment Schemes
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Secret Sharing
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Electronic Vote
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Blind Signature
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