[or-cvs] Answer question about eliminating symmetric encryption from...
nickm at seul.org
Mon Jun 2 02:18:18 UTC 2003
Update of /home/or/cvsroot/src/or
In directory moria.mit.edu:/tmp/cvs-serv27580/src/or
Answer question about eliminating symmetric encryption from onion skins
RCS file: /home/or/cvsroot/src/or/onion.c,v
retrieving revision 1.51
retrieving revision 1.52
diff -u -d -r1.51 -r1.52
--- onion.c 28 May 2003 02:03:25 -0000 1.51
+++ onion.c 2 Jun 2003 02:18:16 -0000 1.52
@@ -428,7 +428,20 @@
* The first 128 bytes are RSA-encrypted with the server's public key,
* and the last 16 are encrypted with the symmetric key.
-/* FIXME: Nick: looks like we could simplify this by just using 128 bytes for g^x. */
+ Nick: looks like we could simplify this by just using 128 bytes for g^x.
+ Problem: this will fail if g^x is greater than the RSA modulus.
+ We'd need to repeatedly generate g^x, until we got one that was
+ < the RSA modulus. Also, if we ever can afford to revert to a
+ bigger DH key, we'll need to revert. Are these 'features' ok?
+ If so, we can omit the symmetric encryption.
+ Convesely, we can just increment RSA key sizes. Since we don't
+ use them very often comparatively, we may be able to afford 1536
+ bits. (Just a thought.)
More information about the tor-commits