Can someone give me an example of an attack on a message exchange using this encryption scheme, that uses the homomorphic property?

In my opinion, Existential forgery under directed message attack uses malleability. Can someone explain it in more detail?

  • $\begingroup$ Please, what do you mean by "message exchange attack"? $\endgroup$ – Hilder Vitor Lima Pereira Aug 15 '18 at 13:30
  • $\begingroup$ @HilderVitorLimaPereira Like, replay attack or parallel session attack etc. $\endgroup$ – M.J.Watson Aug 15 '18 at 17:49

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