In cryptography, Pohlig-Hellman is a symmetric cipher. In number theory, the Pohlig–Hellman algorithm sometimes is a special-purpose algorithm for computing discrete logarithms in a multiplicative group whose order is a smooth integer. The cipher builds upon the number theory algorithm.

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Pohlig-Hellman exponentiation block cipher

Let $G$ be a group of order $n$ and let $e,d$ be integers such that $ed\equiv 1 \pmod{n}$. Then the exponentiation maps $x \mapsto x^e$ and $y \mapsto y^d$ are inverse maps on $G$. These maps give us ...