  In recent years, there has been a proliferation of declarative logic-based
trust management languages and systems proposed to ease the description,
configuration, and enforcement of security policies. These systems have
different tradeoffs in expressiveness and complexity, depending on the security
constructs (e.g. authentication, delegation, secrecy, etc.) that are supported,
and the assumed trust level and scale of the execution environment. In this
paper, we present LBTrust, a unified declarative system for reconfigurable
trust management, where various security constructs can be customized and
composed in a declarative fashion. We present an initial proof-of-concept
implementation of LBTrust using LogicBlox, an emerging commercial Datalog-based
platform for enterprise software systems. The LogicBlox language enhances
Datalog in a variety of ways, including constraints and meta-programming, as
well as support for programmer defined constraints which on the meta-model
itself ? meta-constraints ? which act to restrict the set of allowable
programs. LBTrust utilizes LogicBlox?s meta-programming and meta-constraints to
enable customizable cryptographic, partitioning and distribution strategies
based on the execution environment. We present uses cases of LBTrust based on
three trust management systems (Binder, D1LP, and Secure Network Datalog), and
provide a preliminary evaluation of a Binder-based trust management system.
