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File \hyperlink{blockmode_8h}{blockmode.h} ]Additional modes, such as C\-F\-B and O\-F\-B.  
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File \hyperlink{elgamal_8h}{elgamal.h} ]Implement El\-Gamal encryption and decryption.

Explore the possibility of using simultaneous multiple exponentiation, as described in H\-A\-C, 14.\-87 (iii).
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