Sir,
Like any other UAV, the beast of kandahar is operated through electromagnetic waves, the connection is of read and write type to wirelessely control the UAV, which if the connection is caught and decrypted, then the UAV can be manipulated, the way you want it to.
But in the case of F16, they are operated manually, the connection doesnt need to be of 'write' type, it also doesnt need to be of 'read' kind, but if it is of read kind, and gives out the gps location of the f16 to americans, then potentially the indians can also read that location of the f16, we can also read it, which will create problems for us to buy more of f16.
Sir, in the end, if the connection is blocked for 'write' wirelessly, then no hacker can open it, but if they have potentially left any backdoor open for themselves, to be used in war condition then it can be used by anyone, by anyone i also met we can also hack it and dont let anyone enter it.
(p.s by f16 here i met the pakistani f16, the americans f16 may have different source code on read and write wirelessly.)