Variants of the Diffie-Hellman Problem
Many variations of the Diffie-Hellman problem exist that can be shown to be equivalent to one another. We consider following variations of Diffie-Hellman problem: square computational and Square decisional Diffie-Hellman problem, inverse computational and inverse computational decisional Diffie-Hellman problem and divisible computational and divisible decisional Diffie-Hellman problem. It can be shown that all variations of computational Diffie-Hellman problem are equivalent to the classic computational Diffie-Hellman problem if the order of a underlying cyclic group is a large prime. We also describe other variations of the Diffie-Hellman problems like the Group Diffie-Hellman problem, bilinear Diffie-Hellman problem and the Elliptic Curve Diffie-Hellman problem in this chapter.