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\item[File \hyperlink{blockmode_8h}{blockmode.h} ]Additional modes, such as CFB and OFB. 
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\item[File \hyperlink{elgamal_8h}{elgamal.h} ]Implement ElGamal encryption and decryption.

Explore the possibility of using simultaneous multiple exponentiation, as described in HAC, 14.87 (iii).
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