Jmeter Scripting for body data having “Info”

2018-03-09 08:55:50

Out site is using lots of angular Js. now when I record script for login it has some 5-6 requests recorded. out of those 3 requests are having endcoded key in body data as below.

{"Info":"V8P+Pq/Mq9zNIe0auzRwDvTs+m3tv2gcCGUiU/hI2elP45n2ySmevibc5XFoyhrO"}

I have checked this key is not coming from server and it seems to be generated by client side. this key is different for each user.

however for 1 user key remains same everytime i login. currently I am using approach where I store this keys for all 50 user in CSV file and parameterizing it as below;

{"Info":"${LastLoginKey}"}

is this correct approach ? or shall I do something smart ? because this required me to record key for each user manually and then putting in csv.