Hi, My name is Abel. I had been working with PHP4 and PHP5. In fact, I almost always worked with PHP4. Maybe, I can help you, giving a piece of advice.
First of all, It's not any secure to send your important data through GET method. Because, any people can see your data, even if it's encrypted!!!.
So, try always to send your data through POST method. Although, we all know that it can also be captured by hackers.
Then, I can tell you, at least by now, that the most secure way to send your data is to encrypt it and send it by POST. I need to know what version of PHP you are dealing with. Is it PHP5?. Because If it were PHP5, I could tell you some ways to encrypt your data with PHP5. PHP5 already has done some techniques to encrypt data.
By the other hand, there is a protocol called SSL. And when you send data through it, it's secure in Internet. But, sorry, I don't know much about it.
In conclusion, tell me what version you are working on. And then, I will look for a way to encrypt your data if you agree, of course.
Regards,
Abel Conde
Software Developer
[email protected]--