Overview over homomorphic encryption schemes

From: Anika Schwanstein (schwanstein_at_msn.it)
Date: 08/27/04 

Date: Fri, 27 Aug 2004 14:53:38 +0200

Hi,

can someone give me a short overview over the different cryptosystems which
are homomorphic. I know about 3 systems:
ElGamal-scheme
Paillier-scheme
Damgaard/Jurik-scheme
Are there more?
A very interesting property of the Damgaard/Jurik-scheme is the
length-felxibility. Are there more schemes which support this length
flexibility?

Thanks in advance,
Anika