Suppose some author provides his original research article to a journal for publication. In this way, he is disclosing or revealing his confidential research work to that journal. Now, consider the case that his article gets rejected. So, is it not possible that whoever reviews that article can publish that kind of work and say that it's theirs? Since the original author's work has not been published and he is disclosing his confidential work to somebody, how could the author get assurance that if his article is rejected, his work will not be leaked by the journal staff in any form? What happens if this kind of thing happens?