he U.S. Government agency NIST has recently proposed a public key digital signature standard [3, 4]. Although the proposal is nominally only "for government use" such a proposal, if adopted, would likely have an effect on commercial cryptography as well. In this note I review and comment on NIST's proposal. Positive Aspects The following positive aspects of… (More)
Rules below 117 are omitted, since they are trivial mappings. Although the full type system of Express is represented in the Working Form, type derivations are not performed. It is theoretically possible to assign a type to any expression on the basis of the operator and operands (or by looking up a function in the symbol table), but this functionality is… (More)
Data sharing is a difficult problem with a variety of issues. There is a need to share data across multiple enterprises, different hardware platforms, different data storage paradigms , and a variety of network architectures. The ISO Standard for the Exchange of Product Model Data (STEP) addresses this need by providing information models which clearly and… (More)
This document is part of the National PDES Testbed Report Series and is intended to complement the other reports of the Validation Testing System (VTS) project. Other documents describe the methodology for model validation and software requirements for automating that methodology. The problem of sharing data has many facets. The need for the capability to… (More)
The need to share complex product data across multiple enterprises, using different computing systems and networks is growing. The ISO Standard for the Exchange of Product Model Data (STEP) addresses this need by providing information models which clearly and unambiguously describe this data for different enterprise applications. The validity of these… (More)
Certain commercial products are identified in this paper in order to specify adequately the configuration management procedures. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the products identified are necessarily the best available for the purpose.
Preface This document describes a plan to develop a product data exchange network to serve the needs of both international and national PDES / STEP efforts. The Product Data Exchange Network will be an integral part of the National PDES Testbed which was established at the National Institute of Standards and Technology (NIST) in 1988 under the sponsorship… (More)
1 The views expressed in this article are those of the authors and do not reflect the official policy or position of the National Defense University, the Department of Defense, or the U.S. Government. All information and sources for this paper were drawn from unclassified materials. Acknowledgements. Many people contributed to this effort. Interviews were… (More)