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Hash Based Data Structures
Hash, hashes, hash mark, or hashing may refer to: Substances * Hash (food), a coarse mixture of ingredients * Hash, a nickname for hashish, a cannabis product Hash mark *Hash mark (sports), a marking on hockey rinks and gridiron football fields * Hatch mark, a form of mathematical notation * Number sign (#), also known as the hash, hash mark, or (in American English) pound sign * Service stripe, a military and paramilitary decoration * Tally mark, a counting notation Computing * Hash function, an encoding of data into a small, fixed size; used in hash tables and cryptography * Hash table, a data structure using hash functions * Cryptographic hash function, a hash function used to authenticate message integrity * URI fragment, in computer hypertext, a string of characters that refers to a subordinate resource * Geohash, a spatial data structure which subdivides space into buckets of grid shape * Hashtag, a form of metadata often used on social networking websites * hash (Unix), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hash (food)
Hash is a culinary dish consisting of chopped meat, potatoes, and fried onions. The name is derived from , meaning "to chop". It originated as a way to use up leftovers. In the U.S. by the 1860s, a cheap restaurant was called a "hash house" or "hashery." Canned corned beef hash became especially popular in countries such as Britain, France, and the United States, during and after the Second World War as rationing limited the availability of fresh meat. Hash may be served for breakfast, lunch, or supper. When served for breakfast in the United States hash may come with eggs, toast, hollandaise sauce, or baked beans. High-end restaurants offer sophisticated hash dishes on their menus. Modern preparations can be made with unconventional ingredients such as lamb, fish, venison, turkey, chicken, shrimp, or steak. United States "Hash" of many forms was part of the American diet since at least the 18th century, as is attested by the availability of numerous recipes and the e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hashtag
A hashtag is a metadata tag that is prefaced by the hash (also known as pound or octothorpe) sign, ''#''. On social media, hashtags are used on microblogging and photo-sharing services such as Twitter or Instagram as a form of user-generated tagging that enables cross-referencing of content by topic or theme. For example, a search within Instagram for the hashtag ''#bluesky'' returns all posts that have been tagged with that term. After the initial hash symbol, a hashtag may include letters, numerals, or underscores. The use of hashtags was first proposed by American blogger and product consultant Chris Messina in a 2007 tweet. Messina made no attempt to patent the use because he felt that "they were born of the internet, and owned by no one". Hashtags became entrenched in the culture of Twitter and soon emerged across Instagram, Facebook, and YouTube. In June 2014, ''hashtag'' was added to the ''Oxford English Dictionary'' as "a word or phrase with the symbol ''#'' in front o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hash (EP)
'' ' (read as "hash") is the second extended play by South Korean girl group Loona. It was released on February 5, 2020, by Blockberry Creative and distributed by Kakao M. Background On March 31, 2019, a teaser titled "#" was released on the group's official YouTube channel. The clip looks back to Loona's previous releases and teaser films and ends with the word "burn". It also features imagery of butterflies, as well as the symbols "++" and "xx". On May 31, a second teaser was released titled "La Maison Loona", with the phrase "delayed but someday" showed at the end. On December 13, a teaser titled "#1" was released. On December 31, an image teaser was released. On January 8, 2020, it was announced that member HaSeul would halt activities with the group due to health concerns. On January 10, a second teaser was released titled "#2", setting the release date to February 5. On January 13, individual teasers started to being released, starting with member Olivia Hye and ending wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hash House Harriers
The Hash House Harriers (HHH or H3) is an international group of non-competitive running social clubs. An event organized by a club is known as a Hash or Run, or a Hash Run. A common denominal verb for this activity is Hashing, with participants calling themselves Hashers. Male members are referred to as Harriers, which females are known as Hariettes. The Hash is humorously known as ''A Drinking Club With A Running Problem,'' with the preferred beverage of consumption being beer. History Hashing originated in December 1938 in Kuala Lumpur, Selangor, then in the Federated Malay States (now Malaysia). A group of British immigrants began meeting on Friday evenings prior to the war (1938-1941), but switched to Monday evenings (starting in 1946) to run, in a fashion patterned after the traditional British paper chase or "Hare & Hounds". Apart from the excitement of chasing the Hare and finding the trail, Harriers reaching the end of the trail would partake of beer, ginger beer, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distributed Ledger
A distributed ledger (also called a shared ledger or distributed ledger technology or DLT) is the consensus of replicated, shared, and synchronized digital data that is geographically spread (distributed) across many sites, countries, or institutions. In contrast to a centralized database, a distributed ledger does not require a central administrator, and consequently does not have a single (central) point-of-failure. In general, a distributed ledger requires a peer-to-peer (P2P) computer network and consensus algorithms so that the ledger is reliably replicated across distributed computer nodes (servers, clients, etc.). The most common form of distributed ledger technology is the blockchain (commonly associated with the Bitcoin cryptocurrency), which can either be on a public or private network. Infrastructure for data management is a common barrier to implementing DLT. In some cases, where the distributed digital information functions as an accounting journal rather than an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hashgraph
Hashgraph is a distributed ledger technology that has been described as an alternative to blockchains. The hashgraph technology is currently patented, is used by the public ledger Hedera, and there is a grant to implement the patent as a result of the Apache 2.0's Grant of Patent License (provision #3) so long as the implementation conforms to the terms of the Apache license. The native cryptocurrency of the Hedera Hashgraph system is HBAR. Unlike blockchains, hashgraphs do not bundle data into blocks or use miners to validate transactions. Instead, hashgraphs use a "gossip about gossip" protocol where the individual nodes on the network "gossip" about transactions to create directed acyclic graphs that time-sequence transactions. Each "gossip" message contains one or more transactions plus a timestamp, a digital signature, and cryptographic hashes of two earlier events. This makes Hashgraph form an asynchronous Byzantine Fault-Tolerant (aBFT) consensus algorithm. Hashgraph w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zobrist Hashing
Zobrist hashing (also referred to as Zobrist keys or Zobrist signatures Bruce Moreland/ref>) is a hash function construction used in computer programs that play abstract board games, such as chess and Go, to implement transposition tables, a special kind of hash table that is indexed by a board position and used to avoid analyzing the same position more than once. Zobrist hashing is named for its inventor, Albert Lindsey Zobrist.Albert Lindsey Zobrist''A New Hashing Method with Application for Game Playing'' Tech. Rep. 88, Computer Sciences Department, University of Wisconsin, Madison, Wisconsin, (1969). It has also been applied as a method for recognizing substitutional alloy configurations in simulations of crystalline materials. Zobrist hashing is the first known instance of the generally useful underlying technique called tabulation hashing. Calculation of the hash value Zobrist hashing starts by randomly generating bitstrings for each possible element of a board game, i.e. f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Password Hash
In cryptography, a key derivation function (KDF) is a cryptographic algorithm that derives one or more secret keys from a secret value such as a master key, a password, or a passphrase using a pseudorandom function (which typically uses a cryptographic hash function or block cipher). KDFs can be used to stretch keys into longer keys or to obtain keys of a required format, such as converting a group element that is the result of a Diffie–Hellman key exchange into a symmetric key for use with AES. Keyed cryptographic hash functions are popular examples of pseudorandom functions used for key derivation. History The first deliberately slow (key stretching) password-based key derivation function was called "crypt" (or "crypt(3)" after its man page), and was invented by Robert Morris in 1978. It would encrypt a constant (zero), using the first 8 characters of the user's password as the key, by performing 25 iterations of a modified DES encryption algorithm (in which a 12-bit numbe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hash Chain
A hash chain is the successive application of a cryptographic hash function to a piece of data. In computer security, a hash chain is a method to produce many one-time keys from a single key or password. For non-repudiation a hash function can be applied successively to additional pieces of data in order to record the chronology of data's existence. Definition A hash chain is a successive application of a cryptographic hash function h to a string x. For example, h(h(h(h(x)))) gives a hash chain of length 4, often denoted h^(x) Applications Leslie LamportL. Lamport, “Password Authentication with Insecure Communication”, Communications of the ACM 24.11 (November 1981), pp 770-772/ref> suggested the use of hash chains as a password protection scheme in an insecure environment. A server which needs to provide authentication may store a hash chain rather than a plain text password and prevent theft of the password in transmission or theft from the server. For example, a se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hash (Unix)
hash is a command (computing), command on Unix and Unix-like operating systems that prints the location information for the commands found. The command has also been ported to the IBM i operating system. Syntax $ hash [name] Description When the user gives a command, the shell searches for the command in the path specified in the PATH (variable), PATH environmental variable and stores the location in the hash. This command can be used to search for the command given. The command is built into the shell. C shell implements this command in a different way. Options The following options are supported. ;name: Searches the PATH environmental variable for the name given Exit Status This command returns the following exit values: ;0: Successful completion ;1: An Error occurred Examples $ hash Print the hash table. $ hash cat Searches for command cat in the path specified by PATH environmental variable; if found, adds it to the hash. See also * Find (Unix), find * Unix s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geohash
Geohash is a public domain geocode system invented in 2008 by Gustavo NiemeyerEvidences at the Wayback Machine: labix.org in 2008, the G. Niemeyer's blog announcing Geohash *an article about Geohash witnessing and citing G. Niemeyer works, before 2012 G. Niemeyer's post at forums.geocaching.com announcing Geohash in Feb. 2008 which encodes a geographic location into a short string of letters and digits. Similar ideas were introduced by G.M. Morton in 1966.G. M. Morton (196''"A Computer Oriented Geodetic Data Base and a New Technique in File Sequencing"''. Report in IBM Canada. It is a hierarchical spatial data structure which subdivides space into buckets of grid shape, which is one of the many applications of what is known as a Z-order curve, and generally space-filling curves. Geohashes offer properties like arbitrary precision and the possibility of gradually removing characters from the end of the code to reduce its size (and gradually lose precision). Geohashing guarantees th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hashish
Hashish ( ar, حشيش, ()), also known as hash, "dry herb, hay" is a drug made by compressing and processing parts of the cannabis plant, typically focusing on flowering buds (female flowers) containing the most trichomes. European Monitoring Centre for Drugs and Drug Addiction, Lisbon, It is consumed by smoking, typically in a pipe, bong, vaporizer or joint, or via oral ingestion. Hash has a long history of usage in countries such as Morocco, Egypt, Afghanistan, India, Nepal, Iran, Palestine and Lebanon. Hash consumption is also popular in Europe. In the United States, dried flowers or concentrates are more popular, though hash has seen a rise in popularity following changes in law. Like many recreational drugs, multiple synonyms and alternative names for hash exist, and vary greatly depending on the country and native language. Hash is a cannabis concentrate product composed of compressed or purified preparations of stalked resin glands, called trichomes, from the plant. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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