`As far as I understand, Elliptic Curve Pohlig-Hellman is not public-key.`

`It's a private key cipher.`

Regards, Sergio.

On 22/03/2010 09:56 a.m., Zacheusz Siedlecki wrote:

Hi, Elliptic Curve Pohlig-Hellman is comutative. It's quite simple. I've implemented it. Regards, Zacheusz Siedlecki On Sun, Mar 21, 2010 at 10:13 PM, Sergio Lerner <sergioler...@pentatek.com> wrote: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.

--------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to majord...@metzdowd.com