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
