求助大神们以下该如何解密

k68354037

9995733e2a36d851570b898ec001f7ef{"MD1":0,"op":198144,"MD2":"0*3798575009471","data":{"tplId":"NPC-110016","id":"NPC-6-11","_time_":1480090681}}


2be5bed1de89d63c37680485e42fc96d{"MD1":0,"op":198144,"MD2":"0*3122639106764","data":{"tplId":"NPC-110016","id":"NPC-6-11","_time_":1480090681}}


ab6e3606f37e4aa2ed27592dc5cb2e2c{"MD1":0,"op":198144,"MD2":"0*3170109684025","data":{"tplId":"NPC-110016","id":"NPC-6-11","_time_":1480090681}}


742483a040de6f08d521d115e9753e8e{"MD1":0,"op":198144,"MD2":"0*3672723485765","data":{"tplId":"NPC-110016","id":"NPC-6-11","_time_":1480090681}}


以上是我截取到的对话NPC的封包，顺序是从上到下，每次对话都会改变前面那段密码和MD2里面的密码，想大神帮忙看看，这种类型的需要怎么解密呢，谢谢了