I looking for a public-key cryptosystem that allows commutation of the operations of encription/decryption for different users keys
( Ek(Es(m)) =  Es(Ek(m)) ).
I haven't found a simple cryptosystem in Zp or Z/nZ.

I think the solution may be something like the RSA analogs in elliptic curves. Maybe a scheme that allows the use of a common modulus for all users (RSA does not). I've read on some factoring-based cryptosystem (like Meyer-Muller or Koyama-Maurer-Okamoto-Vantone) but the cryptosystem authors say nothing about the possibility of using a common modulus, neither for good nor for bad.

Anyone has a deeper knowledge on this crypto to help me?

Best regards,
 Sergio Lerner.

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