That information should already be encrypted via the web pages you are using when the information is sent. Since that is highly sensative information unless you know that the page is secure and encrypted you shouldnt be using it at all. That is not jsut something you could do cause it also requires the servers to have this protection as well. It wouldnt do you any good to send it out encrypted over the internet.
Its like this. The web page askes for information. Now when you enter it and send it the first packet has the key to unlock the encryption. This is what was originally requested from the server. Now you send the information encrypted.
If the information is intercepted by someone else they didnt get the first packet which told them how to unlock the encryption and read teh data. So to them it is useless. Only the Server that requested the information has the key to unlock the data.
That is why you must make sure that the pages you visit are secure. If not do not give the information out. IT is a 2 way street to protect the infromation. It is not just something you can do on your own.
Using that same analogy as above without the server part.
You have sensative information to send. But it wasnt requested by the server and you encrypt it. Now you send it out as encrypted but you dont send the key on how to unlock the information to the server. Now the server gets the info but without the key the data is useless and sends you a error cause it cant read the data.
I hope that helps you understand how this secure data transfer works. It is required on both ends. Not just yours.