Since the discussions have started about a new release of Camel, I checked the version of Jsch used. Currently Camel uses version 0.1.49 which is rather old (from 2012-10-11). The latest version is 0.1.50 (from 2013-05-09). One of the bugs fixed has to do with a "verify" error on Java7u6 (and later).
I think Java 7 support is very important and suggest that Camel upgrades Jsch to 0.1.50 in the next release of Camel. Bengt Rodehav