android - C# mvc web api. Convert json plain text to cipher text over http -

i developing mobile backend application written in c# mvc web api's. know best secure mechanism transmit json data. there issue sending data in json format, or should convert json som encrypted format? actual data this.

{ "id":2130, "location":"florida" } 

my question is, there way convert json other format can decrypted @ mobile side folllows

{ "zxs#%df":"dfd5d2f", "fgfd5f5gdd":"fdgfdg699" } 

or plain text

"dfsdfs^^dfsd^%$$fsdfsd*fs6556df$6" 

which can converted actual json data

use https.

it unlikely can create our own protocol comparable security.