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A small phone book as a hash table. In computer science, a hash table is a data structure that implements an associative array, also called a dictionary or simply map; an associative array is an abstract data type that maps keys to values. [2]
Chris Messina suggested using hashtags on Twitter. The number sign or hash symbol, #, has long been used in information technology to highlight specific pieces of text. In 1970, the number sign was used to denote immediate address mode in the assembly language of the PDP-11 [12] when placed next to a symbol or a number, and around 1973, '#' was introduced in the C programming language to ...
Often, an additional hash of the hash list itself (a top hash, also called root hash or master hash) is used.Before downloading a file on a p2p network, in most cases the top hash is acquired from a trusted source, for instance a friend or a web site that is known to have good recommendations of files to download.
A distributed hash table (DHT) is a distributed system that provides a lookup service similar to a hash table. Key–value pairs are stored in a DHT, and any participating node can efficiently retrieve the value associated with a given key.
Extendible hashing is a type of hash system which treats a hash as a bit string and uses a trie for bucket lookup. [1] Because of the hierarchical nature of the system, re-hashing is an incremental operation (done one bucket at a time, as needed).
File verification is the process of using an algorithm for verifying the integrity of a computer file, usually by checksum.This can be done by comparing two files bit-by-bit, but requires two copies of the same file, and may miss systematic corruptions which might occur to both files.
The eD2k hash function is a root hash of a list of MD4 hashes.It gives a different result than a simple usage of the MD4 algorithm. The file data is divided into full chunks of 9500 KiB (9728000 bytes) plus a remainder chunk, and a separate 128-bit MD4 checksum is computed for each.
The rapid growth of COVID-19 led to an unprecedented response globally. Santanu was appointed as a member of the COVID-19 Mobility Data Network at Harvard University to "provide daily updates to decision-makers at the state and local levels on how well social distancing interventions are working."