%0 Conference Paper %B Indo-US Workshop on International Trends in Digital Preservation %D 2009 %T Tools and Services for Long-Term Preservation of Digital Archives %A JaJa, Joseph F. %A Smorul,M. %A Song,S. %X We have been working on a technology model to support thepreservation and reliable access of long term digital archives. The model is built around a layered object architecture involving modular, extensible components that can gracefully adapt to the evolving technology, standards, and protocols. This has led to the development of methodologies, tools and services to handle a number of core requirements of long term digital archives. Specifically, we have built flexible tools for implementing general ingestion workflows, active monitoring and auditing of the archive’s collections to ensure their long-term availability and integrity, storage organization and indexing to optimize access. These tools are platform and architecture independent, and have been tested using a wide variety of collections on heterogeneous computing platforms. In this paper, we will primarily focus on describing the underpinnings of our software called ACE (Auditing Control Environment), and report on its performance on a large scale distributed environment called Chronopolis. Built on top of rigorous cryptographic techniques, ACE provides a policy- driven, scalable environment to monitor and audit the archive’s contents in a cost effective way. In addition, we will briefly introduce some our recent efforts to deal with storage organization and access of web archives. Long term preservation is a process that must begin before an object is ingested into the archive and must remain active throughout the lifetime of the archive. The ACE tool provides a very flexible environment to actively monitor and audit the contents of a digital archive throughout its lifetime, so as to ensure the availability and integrity of the archive’s holdings with extremely high probability. ACE is based on rigorous cryptographic techniques, and enables periodic auditing of the archive’s holdings at the granularity and frequency set by the manager of the archive. The scheme is cost effective and very general, does not depend on the archive’s architecture, and can detect any alterations, including alterations made by a malicious user. ACE can gracefully adapt to format migrations and changes to the archive’s policies. %B Indo-US Workshop on International Trends in Digital Preservation %8 2009/// %G eng