how to post secure data via iPhone?

Question

For example, I want to sent information like credit card number, password etc so what's the best way to do the same?

Answer 1

Send with SSL encryption. Have a look at How to use NSURLConnection to connect with SSL for an untrusted cert? for some code

Answer 2

use encryption algorithms......

Answer 3

If you are posting to a web service, make sure you are using a HTTPS connection when you are calling to:

NSMutableURLRequest *urlRequest=[NSMutableURLRequest requestWithURL:url];
[ NSURLConnection sendSynchronousRequest: urlRequest returningResponse: nil error: &error ];