Okay, I've got this. Encryption and digital signatures are definitely data-oriented since they protect the data itself. Identity and access management and single sign-on are more about controlling who can access the data, so those wouldn't be considered data-oriented mechanisms.
This is a classic class imbalance problem. I'd start by trying option C - downsampling the data with upweighting. That should help the model converge without losing too much information. If that doesn't work, I might try generating some synthetic positive examples as a last resort.
Sherell
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