CPA vs. CCA

links: AC1 TOC - Private Key Encryption - AC1 TOC - From Symmetric Encryption to Secure Channels - Index

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Comparison

Similarities

• Both are attacker models
• Attacker can chose inputs and observe corresponding outputs

Differences

• In CPA the attacker does not have access to a decryption oracle while CCA attacker does
• IND-CCA is a stronger security model

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links: AC1 TOC - Private Key Encryption - AC1 TOC - From Symmetric Encryption to Secure Channels - Index