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What are the solutions for discrete integers b, d to $a^b \equiv c^d \ (\text{mod} \ p)$ where $p$ is a large prime number?

Is there a way to efficiently discover or choose the integers $b$, $d$ for the congruence relationship below where $p$ is a large prime number? Is there a name for this relationship?

$$ a^{b} = c^{d} \ (\text{mod} \ p) $$