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Feb 21, 2014 at 21:46 comment added DrLecter What you write is true for semantic security of ElGamal encryption. But security oft ElGamal signatures is not related to the DDH assumption in the used group. It would be more than surprising if unforgeability of ElGamal signatures could be reduced to a decisional problem instead of a computational one.
Feb 21, 2014 at 21:06 history edited Habib CC BY-SA 3.0
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Feb 21, 2014 at 20:55 history answered Habib CC BY-SA 3.0