Kerry and Obama are well aware that the mullahs run an oppressive, violent regime that depends on well paid goon squads and thugs to suppress, terrify and keep the population docile. Those goons and thugs are paid very well in non US dollar foreign hard currencies. Kerry and Obama fully understood why the mullahs wanted the ransom paid in cash in Euros and Swiss Francs. Michelle may have come to be “proud of her country” but decent ,rational people loathe the vile Obama and the narcissistic fool Kerry.
With all the secrets being leaked, both recklessly and by plan, by this administration, it is likely there are few if any secure agents or sources left. I would not doubt that either kerry or the Oaf himself leaked the sources name or the info gathered back to Iran to keep their stupid and reckless nuclear deal safe from any disclosure of how bad it actually was.