Which is the most secure steganography technique? Just like we have AES in crypotography, which is the most secure technique in Steganography?
I am looking for a technique in which the standard image characteristic modifications it does go undetected(as yet).
This question is regarding image steganography and I want to store few bytes of information.
Steganography is in general impossible, and most "practical" schemes do not work. If you are really interested in the area, however, there was some work done about a decade ago on provably secure steganography. It relies on an understanding of the distribution of the messages, which is what makes it very problematic in practice. 

Here are a couple of works to get you started: 
https://www.cs.cmu.edu/~biglou/PSS.pdf and
http://cs.brown.edu/~anna/papers/lysmey06.pdf.

I stress, however, once again: practical steganography schemes are broken. They can typically be easily distinguished using basic machine learning tools.