On Mar 21, 2010, at 4:13 PM, Sergio Lerner 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
On 2010-03-22 11:22 PM, Sergio Lerner wrote:
Commutativity is a beautiful and powerful property. See On the power
of Commutativity in Cryptography by Adi Shamir.
Semantic security is great and has given a new provable sense of
security, but commutative building blocks can be combined to build
On 2010-03-23 1:09 AM, Sergio Lerner wrote:
I've read some papers, not that much. But I don't mind reinventing the
wheel, as long as the new protocol is simpler to explain.
Reading the literature, I couldn't find a e-cash protocol which :
- Hides the destination / source of payments.
- Hides
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.
[Moderator's Note: please don't top post... --Perry]
Sounds like a bad idea -- at a minimum, your encryption will be
deterministic.
What are you actually trying to achieve? Usually once you understand that,
you can find a protocol solving your problem already in the crypto
literature.
On
Hi,
Elliptic Curve Pohlig-Hellman is comutative. It's quite simple. I've
implemented it.
Regards,
Zacheusz Siedlecki
2010/3/21 Sergio Lerner sergioler...@pentatek.com:
I looking for a public-key cryptosystem that allows commutation of the
operations of
[Moderator's Note: please don't top post --Perry]
Commutativity is a beautiful and powerful property. See On the power of
Commutativity in Cryptography by Adi Shamir.
Semantic security is great and has given a new provable sense of
security, but commutative building blocks can be combined
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,
[Moderator's Note: Please please don't top post. --Perry]
That paper was from 1980. A few things have changed since then. =)
In any case, my point still stands: what you actually want is some e-cash
system with some special properties. Commutative encryption is neither
necessary nor
I've read some papers, not that much. But I don't mind reinventing the
wheel, as long as the new protocol is simpler to explain.
Reading the literature, I couldn't find a e-cash protocol which :
- Hides the destination / source of payments.
- Hides the amount of money transferred.
- Hides the
[Moderator's note. Please please please don't top post. --Perry]
I think you should look for multisignature schemes. There are lots of it.
And BTW - right EC Pohlih-Hellman is not public key cryptosystem. I
missed your requirement.
Regards,
Zacheusz
2010/3/22,
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