What kind of side effects ? I have no formal training in cryptography, so please forgive me if this is a naive question.
I mean you still have to give the encrypted data to someone. They can't tell what it is but they can see you are up to something. So you still have to use some additional sort of trust mechanism if you don't want the act of giving encrypted fore-notice to influence behavior.
Ah ok, that makes sense. In this case, you can employ steganography. For example, you could publish an unrelated article using a pretty image as a header. When the time comes, you reveal the algorithm and password required in order to extract your secret message from the image.
Here's the new thread for posting quotes, with the usual rules: