GSSContext's wrap() and MessageProp: Which enryption is used and available

Hi there,
I have got a question regarding GSSContext's wrap()/unwrap() methods.
These methods take a parameter, class MessageProp,
an instance of this class is used to indicate the desired Quality-of-Protection (QOP)The qop is can be set by an integer, but which kind of protection is it indicated by which number? Which kind of encryption is used, which are available?
How secure are these message exchanges?

ahh, I see, could've guessed that myself... Thank for your reply!
Anyway, DES3 seems to be the weapon of choice as it is supported by the Java Kerberos module, but obviously not by my Active Directory/KDC.
After some further investigations I found out that DES can be hacked withing 24h, but: the Kerberos clock skew is 5min and our ticket lifetime 8hrs. So there's a remaining risk which seems to be justifiable. What do you think of that?

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