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For a crypto algorithm that acts like a group, the first thing that comes to mind is Pohlig-Hellman. In this method, we have a large prime $p$, and define: $$E_A(Data) = Data^A \bmod p$$ (with $A$ relatively prime to $p-1$) This has the property that $E_B(E_A(Data)) = E_{A \times B \bmod p-1}(Data)$; however it has the security properties you're looking ...

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