}
String knownHosts = defaultSSHDir + "/known_hosts";
knownHosts = System.getProperty("ssh.knownhosts", knownHosts);
jsch.setKnownHosts(knownHosts);
identityFile = System.getProperty("ssh.identity", identityFile);
jsch.addIdentity(identityFile, passphrase.getBytes());
session = jsch.getSession(user, host);
Properties props = new Properties();
props.put("compression.s2c", "none");
props.put("compression.c2s", "none");
props.put("cipher.s2c", "blowfish-cbc,3des-cbc");