Lios 6.3 should work the same as 6.5 as far as encryption goes. The options for 256 and higher are only available for self signed certificates. If you import your own certificate then it will not show the options. Page 62 and 63 of the user's guide discuss the HTTPS encryption options. [URL] Thanks
I am working on security findings that complain about DSA using a weak and self signed SSL Cert, and I tried to get a certificate issued for it since we have a wildcard cert, but it appears that DSA issues the CSR using a 1024 bit key.. and our current SSL cert provider won't issue a cert with anything less than a 2048 bit key.  Is there a new version that supports a 2048 bit key or another way to work around this? 
CSR with 2048 bit Key from DSA?