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Hashed Files

  • IS.HASH.SHA1: Generating SHA1 values with Generic MultiValue BASIC

    In cryptography, SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function designed by the United States National Security Agency and is a U.S. Federal Information Processing Standard published by the United States NIST. SHA1 is used in many places to generate a unique Hash value representing a string or file. It is widely used in place of MD4 and MD5 ash a more secure hash value. While not as secure as SHA256, it is still used in many places for data integrity, version control, and other features that need an unique one-way signatures.

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  • UniVerse and UniData Hashed Files - Part 2

    In part two of this series, Peggy and Jeff will guide us to a better understanding of the hashing mechanism, from modulo and separation, all the way to overflow and resizing.

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  • UniVerse and UniData Hashed Files: Part 1

    The MultiValue Database and its descendants are noted for their flexibility in handling of data. This is a radical departure from traditional, fixed-length data records found in other SQL databases, and provides a very attractive environment for business applications. This flexible structure places demands on the underlying data storage mechanisms. To meet these demands, MultiValue databases use a hashed file structure. This series of articles will examine in depth the specifics of hashed files as implemented in the UniVerse and UniData environments.

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