Transmitter architectures designed to accommodate both constant and non-constant of envelope modulation schemes and capable of providing local oscillator carrier frequencies within any one of numerous desired frequency bands, thus allowing compliance with many different communication standards. Using bilinear mappings, such as Weil or Tate pairings, these methods and systems enable generation and verification of efficient multisignatures, identity-based ring signatures, hierarchical proxy signatures, and hierarchical onlineoffline signatures. The invention is based on utilizing information contained in the document collection about the statistics of word relationships to facilitate the specification of search queries and document comparison. For example, when a policy is added, it can be compared against a set of tagging rules. A ram assembly is mounted to the housing and extends through the backing plate. In one embodiment, the present invention is comprised of a first member and a second member removably coupled to the first member.