It's true that many common forms of steganography (such as hiding information in the alpha channels of a given image) are easily detectable, and analyzers already exist, but in some aspects steganalysis is somewhat of an oxymoron, since the entire point of steganography is to conceal the fact that hidden information even exists in the first place.
I'm not sure exactly how you'd define a steganographic protocol. It's not quite as straightforward as cryptography, in fact it's yet again oxymoronic. Steganography (at least ideally) works somewhat like an archetypal spy's codebook. It sounds like everyday conversation to you, unless you're meant to know it's not, and that there's a hidden meaning. If you catch something off-guard, then the stego has failed.
I'm not sure exactly how you'd define a steganographic protocol. It's not quite as straightforward as cryptography, in fact it's yet again oxymoronic. Steganography (at least ideally) works somewhat like an archetypal spy's codebook. It sounds like everyday conversation to you, unless you're meant to know it's not, and that there's a hidden meaning. If you catch something off-guard, then the stego has failed.