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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)
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)
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)