>>31
I want to say no. Steganography is about making information obscure. To find the information, you need to know where to look and how it is encoded. The ``where to look'' and ``how it is encoded'' form a weak private key if you will. Although this isn't a substitute for encryption, because ``where to look'' can be brute forced by performing analysis on every piece of information that could possibly contain steganography. And ``how it is encoded'' can be brute forced by trying many known encodings. If the encoded information is not encrypted, it can be reassembled.
You can use public and private key cryptography to encrypt your messages and then transmit them using steganography. Raw encrypted data is obvious to an ease dropper. But encrypted data within steganography takes more analysis to detect.