There is a 4.2.0-fuse-02-00 release which I believe have an updated JCraft bundle.
And there is a 0.1.40 bundle JAR in the maven repos so you can uninstall the old version and then install a never version.
I used the 0.1.42_1 version of the bundle and it worked better (I must take care of algorithms used now).
But the last version of FUSE ESB (4.2.0-fuse-02-00) still uses the 0.1.31_3 version of jsch.
Edited by: jb.ferand on Jul 7, 2010 5:41 PM
It now works completly and great.
I simply forgot to add the Sun JCE library (jre\lib\ext\sunjce_provider.jar) in the classpath to have all the algorithms available.