[145160] in cryptography@c2.net mail archive
Question regarding common modulus on elliptic curve cryptosystems
daemon@ATHENA.MIT.EDU (Sergio Lerner)
Mon Mar 22 08:06:05 2010
Date: Sun, 21 Mar 2010 18:13:02 -0300
From: Sergio Lerner <sergiolerner@pentatek.com>
To: cryptography@metzdowd.com
X-Fib-Al-From: sergiolerner@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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