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Why is Rabin Encryption is considered as not CCA secure and how can I prove it? Any example would be helpful.

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    $\begingroup$ What research have you already done? What is your definition of Rabin encryption? What is the definition of CCA security? $\endgroup$ – Squeamish Ossifrage May 7 '18 at 1:20
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Hint:

  • How would a CCA attack on textbook RSA work?
  • Can you somehow modify a given ciphertext so that it is accepted by the decryption oracle while also yielding useful information afterwards?
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