Secure Content Validation

Information dissemination in electronic form has improved drastically over the past few years. New technologies in Web feeds allow the uses to get notified automatically when new contents are available. Tliough the speedy availability of information is a positive trend, there´s also the concern about the validity of information. Let us consider a content producer, who creates and publishes an article based on information from confidential sources. When any of these confidential sources becomes invalid, it is imperative that the end-user who relies on the content of the article be informed. As time passes, the article would have reached many who are often non-traceable to be informed. Given this selling, we develop models for ensuring the confidentiality and secrecy of sources, and also allow the end-user to perform certain operations in reasoning about the validity of articles. We present three types of models, and protocols that solve this problem efficiently.