Hash Function and Hash Value  Python Automation and Machine Learning for ICs   An Online Book  

Python Automation and Machine Learning for ICs http://www.globalsino.com/ICs/  


Chapter/Index: Introduction  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  Appendix  
================================================================================= A hash function is a mathematical function that takes an input (or "message") and returns a fixedsize string of characters, which is typically a hash value. The primary purpose of a hash function is to transform data of arbitrary size into a fixedsize string of characters, commonly for purposes such as indexing data in hash tables, ensuring data integrity, and generating digital signatures. The length of the hash value is determined by the design of the hash function. When people refer to "digits" in the context of a hash function, they often mean the hexadecimal characters (09 and AF) if the hash value is represented in hexadecimal form. Each hexadecimal character represents four bits, so a 32character hexadecimal hash value is 128 bits. Using only a portion of the hash value (such as the first few digits) for specific applications can still provide a unique identifier while reducing the length of the representation, for instance:
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