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PLEASE don't copy and paste from a previous answer because it was incorrect.
I'm looking for some help in proving that this encryption scheme does not have CCA security by
showing in a proof why it is insecure, with an explanation as well.
1. Let 1 and 2 be two (possibly different) encryption schemes with the same message space M .
Below we define an encryption scheme : Show that does not have CCA security, even if both 1
and 2 have CCA (yes, CCA) security.

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PLEASE don't copy and paste from a previous answer because it was inco.docx

  • 1. PLEASE don't copy and paste from a previous answer because it was incorrect. I'm looking for some help in proving that this encryption scheme does not have CCA security by showing in a proof why it is insecure, with an explanation as well. 1. Let 1 and 2 be two (possibly different) encryption schemes with the same message space M . Below we define an encryption scheme : Show that does not have CCA security, even if both 1 and 2 have CCA (yes, CCA) security.