How to travel with a cake overseas?
If you are allowed to take the cake you can do the following:

1) Ganache the cake after you reach India, preferably indoors as it will melt as you take it along the road.

2) To take the cake along with you during the time of your flight just put it in a ziploc bag and seal it well and it should remain intact and not go bad after you arrive, However, make sure the cake has no form of frosting or anything that has a possibility of melting even remotely.