{"iv":"tqkO+i+e5Z+jDkNbcNM2fQ==",
"v":1,
"iter":1000,
"ks":256,
"ts":64,
"mode":"ccm",
"adata":"",
"cipher":"aes",
"salt":"cqYGSlwU3rs=",
"ct":"eYGQcwGdtuYw1mWKKlMhmdA+71tadsBZIOmjrTlNNTjHhqt4c53RS4JV9DWs5Yl+KXqwWLSfiAH9l9lL2Jd2mV6raJvDqUM7Vfwa3ZVSgFFt26uqIGddtLo8IvzkCGpuNLWrZR0peRww1fM247pivWkyQ+6Jy4yuBcOINAycDZWtpQFB48l3GXjmgBRrZfRw2Y2O2Hz3hoIyZy2/G471F0YXvcsdGayw7DHkuT37F/T+sNpVJb85pdEIhIgqwjN9u8Y1pLneYWoiJWQYAh9jlpX0OIVVKehKzboj9ffPE+PjfiKgp0VTbce4Eqnf9tVeALNgT4vXY1HJ7jEJMgWL0UdF99gigKvrYP19PP0="}

(fun fact: you can tell that base64 is encoding a JSON object because it starts with "eyJ"!)

I think we're supposed to decode the "ct" field using the provided ciphers, and the "iv" is the key? Still not sure what "salt" is for, it keeps making me think this is actually a password hash somehow.