Prove formally that el gamal encryption scheme is not cca

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Reference no: EM131239179

1. Prove formally that the El Gamal encryption scheme is not CCA-secure.

2. Prove Theorem 11.22.

Theorem 11.22

If the gap-CDH problem is hard relative to G, and H is modeled as a random oracle, then Construction 11.19 is a CCA-secure KEM.

Reference no: EM131239179

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