this research focuses on the event that we receive a signal or message that is either not directed at us (eavesdropping) or one that is in its natural communicative form. to tackle this difficult, but probable scenario, methods are being developed that first, will detect if a signal has structure indicative of an intelligent source, categorize the type of structure detected, and then decipher its content: from its physical level encoding and patterns to the parts-of-speech that encode internal and external ontologies.