Question regarding common modulus on elliptic curve cryptosystems

[Zacheusz Siedlecki]

Hi,
Elliptic Curve Pohlig-Hellman is comutative. It's quite simple. I've
implemented it.
             Regards,
                   Zacheusz Siedlecki

2010/3/21 Sergio Lerner <sergiolerner at pentatek.com>:
>
> 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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