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A prefix hash tree (PHT) is a distributed data structure that enables more sophisticated queries over a distributed hash table (DHT).[citation needed]
Prefix_hash_tree
Type of data structure
and computer science, a hash tree or Merkle tree is a tree in which every "leaf" node is labelled with the cryptographic hash of a data block, and every
Merkle_tree
Data structure
radix tree (also radix trie or compact prefix tree or compressed trie) is a data structure that represents a space-optimized trie (prefix tree) in which
Radix_tree
Search tree data structure
advantages over hash tables due to their prefix-based organization and lack of hash collisions. Every child node shares a common prefix with its parent
Trie
Data organization and storage formats
Distributed hash table Double hashing Dynamic perfect hash table Hash array mapped trie Hash list Hash table Hash tree Hash trie Koorde Prefix hash tree Rolling
List_of_data_structures
Cryptographic attack
messages m1 and m2 such that hash(m1) = hash(m2). More generally: Chosen-prefix collision attack Given two different prefixes p1 and p2, find two suffixes
Collision_attack
Topics referred to by the same term
for: Philippine Time Pulmonary hypertension Pseudo-Hadamard transform Prefix Hash Tree Polyhexahydrotriazine Postmenopausal hormone therapy Phenytoin This
PHT
Decentralized distributed system with lookup service
caching system. Prefix hash tree: sophisticated querying over DHTs. Merkle tree: tree having every non-leaf node labelled with the hash of the labels of
Distributed_hash_table
Formatted data in computer science
In 2017, Michael Steindorfer introduced CHAMP (Compressed Hash-Array Mapped Prefix-tree), an evolution of the HAMT that uses less space and improves
Hash_array_mapped_trie
Message-digest hashing algorithm
is a widely used hash function producing a 128-bit hash value. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4, and
MD5
Cryptographic hash function
cryptography, SHA-1 (Secure Hash Algorithm 1) is a hash function which takes an input and produces a 160-bit (20-byte) hash value known as a message digest
SHA-1
multiplication operations used in the original fusion tree algorithm. A dynamic version of fusion trees using hash tables was proposed in 1996 which matched the
Fusion_tree
the rest below it (if space on the board permits). Suffix Tree Trie Scrabble Prefix Hash Tree Gordon, Steven A. (1994). "A faster Scrabble move generation
GADDAG
Data structure
ternary search tree is a type of trie (sometimes called a prefix tree) where nodes are arranged in a manner similar to a binary search tree, but with up
Ternary_search_tree
Associative array for storing key–value pairs
is hashed and the resulting hash indicates where the corresponding value is stored. A map implemented by a hash table is called a hash map. Most hash table
Hash_table
Tree containing all suffixes of a given text
also the prefix of another suffix, such a tree does not exist for the string. For example, in the string abcbc, the suffix bc is also a prefix of the suffix
Suffix_tree
Scheme that defines the format of magnet links
BitTorrent v2 replaces the obsolete SHA-1 hash with a SHA-256 info hash. The v2 info-hash is given a new prefix (btmh) to allow for torrents that can participate
Magnet_URI_scheme
Research division of Intel
identification and sensing platform (WISP) Claytronics TinyOS Urban Computing Prefix hash tree PlanetLab Anderson, Ken (March 2009). "Ethnographic Research: A Key
Intel_Research_Labs
Publicly known attacks against cryptographic hash functions
cryptographic hash functions. Note that not all entries may be up to date. For a summary of other hash function parameters, see comparison of cryptographic hash functions
Hash function security summary
Hash_function_security_summary
a checksum. Hash function security summary Secure Hash Algorithms NIST hash function competition Key derivation functions (category) "Hash functions".
List_of_hash_functions
Algorithm
Rendezvous or highest random weight (HRW) hashing is an algorithm that allows clients to achieve distributed agreement on a set of k {\displaystyle k}
Rendezvous_hashing
Random data used as an additional input to a hash function
salt is random data fed as an additional input to a one-way function that hashes data, a password or passphrase. Salting helps defend against attacks that
Salt_(cryptography)
Data structure for approximate set membership
structures for representing sets, such as self-balancing binary search trees, tries, hash tables, or simple arrays or linked lists of the entries. Most of these
Bloom_filter
Cryptographic hash function
particular hash size. Unlike the SHA-2 family, no distinguishing initialization values are defined; they are simply prefixes of the full Tiger/192 hash value
Tiger_(hash_function)
Data structure for storing integers from a bounded domain
query the corresponding hash table in the level-search structure with the prefix of k of the right length. If a node with that prefix does not exist, we know
X-fast_trie
Password-based key derivation function
/etc/shadow file by the $y$ prefix. crypt (C) Lyra2 Password hashing Password Hashing Competition "Changes/yescrypt as default hashing method for shadow". Retrieved
Yescrypt
Particular way of storing and organizing data in a computer
Relational databases commonly use B-tree indice for data retrieval, while compiler implementations usually use hash tables to look up identifiers. Filesystems
Data_structure
Method of building collision-resistant cryptographic hash functions
Merkle–Damgård construction or Merkle–Damgård hash function is a method of building collision-resistant cryptographic hash functions from collision-resistant one-way
Merkle–Damgård_construction
overlay network and routing network for the implementation of a distributed hash table (DHT) similar to Chord. The key–value pairs are stored in a redundant
Pastry_(DHT)
Type of hash system
Extendible hashing is a type of hash system which treats a hash as a bit string and uses a trie for bucket lookup. Because of the hierarchical nature of
Extendible_hashing
Password-based key derivation function
bcrypt is a password-hashing function designed by Niels Provos and David Mazières. It is based on the Blowfish cipher and presented at USENIX in 1999
Bcrypt
Hash based data structure
Kademlia is a distributed hash table for decentralized peer-to-peer computer networks designed by Petar Maymounkov and David Mazières in 2002. It specifies
Kademlia
Key derivation function of password hash
routine support a variety of hash schemes. The particular hash algorithm used can be identified by a unique code prefix in the resulting hashtext, following
Crypt_(C)
Kind of distributed data structure
improve over search tools based on the hash table functionality only. In contrast to skip lists and other tree data structures, they are very resilient
Skip_graph
Type of cryptographic attack
possible values of a hash function, with H = 2 l {\textstyle H=2^{l}} . With a birthday attack, it is possible to find a collision of a hash function with 50
Birthday_attack
Algorithmic problem on pairs of sequences
the checksum or hash is not guaranteed to be unique, there is a small chance that two different items could be reduced to the same hash. This is unlikely
Longest_common_subsequence
individual key–value pairs under radix nodes and hash buckets into an associative array. Unlike a simple hash table, HAT-tries store key–value in an ordered
HAT-trie
hash element uses the syntax $hash_name{$key} – the key is surrounded by curly braces and the hash name is prefixed by a $, indicating that the hash element
Comparison of programming languages (associative array)
Comparison_of_programming_languages_(associative_array)
Digital workload distribution techniques
assemble the results by going back up the tree. The efficiency of such an algorithm is close to the prefix sum when the job cutting and communication
Load_balancing_(computing)
Computer science problem
backwards Store only non-zero values in the rows. This can be done using hash-tables instead of arrays. This is useful for large alphabets. Longest palindromic
Longest_common_substring
Muskogean language spoken in US
syllable is a verbal prefixes class I or III, the affix's vowel may not undergo lengthening, and the same holds true for noun prefixes class III as well
Choctaw_language
which indicates that the episode is track 9 on primary DVD volume 1). A prefix of "NP" (e.g. NP1.01) indicates the episode is the first episode on "Non-Primary"
List_of_Peppa_Pig_episodes
Library provided with a programming language to provide common services
Algorithms, such as sorting algorithms Data structures, such as the list, tree, and hash table Interaction with external systems (input/output) Interaction with
Standard_library
Logical identifier addressing a specific group of devices on a network
A resulting advantage over GLOP is that the unicast-prefix mechanism resembles the unicast-prefix capabilities of IPv6. Administratively scoped The 239
Multicast_address
resolves queries based on prefix matching. The actual topology has no hierarchy. Queries are resolved by matching prefixes. This also determines the choice
P-Grid
character internal to the atom "Canonical S-expression", because the length prefix clearly points to the end of the atom. There is no whitespace separating
Canonical_S-expressions
Style sheet language
selector language by a hash prefix e.g. #id class: an identifier that can annotate multiple elements in a document, denoted by a dot prefix e.g. .classname (the
CSS
inside a single B-tree prefix-compressed and variable length as an uninterpreted sequence of bytes for further compression. The B-tree may typically grow
InfinityDB
function are called hash values, hash codes, digests, or simply hashes. Hash functions are often used in combination with a hash table, a common data
Glossary_of_computer_science
Router architecture
such as hash tables, specialized algorithms, optimized for IP addresses, emerged. They include: Binary tree Radix tree Four-way trie Patricia tree A multicore
Data_plane
Cryptography algorithm
internal IV. It derives a hash of the additional authenticated data and plaintext using the POLYVAL Galois hash function. The hash is then encrypted an AES-key
Block cipher mode of operation
Block_cipher_mode_of_operation
Type of computer memory
some implementations emulate the function of CAM by using standard tree search or hashing designs in hardware, using hardware tricks like replication or pipelining
Content-addressable_memory
Message authentication code algorithm
into message authentication codes (MACs). One-way compression function – Hash functions can be made from block ciphers. But note, there are significant
CBC-MAC
I/O-efficient algorithm regardless of cache size
set". For both execution time and memory usage, the hash table was best, followed by the B-tree, with the Bender set the worst in all cases. The memory
Cache-oblivious_algorithm
Data structure representing a finite set of strings
Word Graph or CWG" – JohnPaul Adamovsky teaches how to construct a DAFSA hash function using a novel encoding with multiple integer arrays (Archived 27
Deterministic acyclic finite state automaton
Deterministic_acyclic_finite_state_automaton
Human-readable data serialization language
multi-line strings is inspired by HTML. Lists and hashes can contain nested lists and hashes, forming a tree structure; arbitrary graphs can be represented
YAML
Programming language
types, though it is usually implemented as a hash table (equivalent to HashMap<K, V> in other languages). Hash tables are built into the language, with special
Go_(programming_language)
Abstract data type
use a stack structure to hold values. Expressions can be represented in prefix, postfix or infix notations and conversion from one form to another may
Stack_(abstract_data_type)
ISBN 978-0-07-226093-9. "InnoDB adaptive Hash", Reference manual 5.0, Development documentation, Oracle = "Forest of Trees", Informix 15.0 online documentation
Comparison of relational database management systems
Comparison_of_relational_database_management_systems
of whose subsequences is not frequent. Support Counting. Normally, a hash tree–based search is employed for efficient support counting. Finally non-maximal
GSP_algorithm
Finite, ordered collection of items
implementations, however, sets are implemented using self-balancing binary search trees or hash tables, rather than a list. Lists also form the basis for other abstract
List_(abstract_data_type)
Computational task of sorting whole numbers
to use a Van Emde Boas tree, one either needs a directly addressable memory of K words, or one needs to simulate it using a hash table, reducing the space
Integer_sorting
2011 edition of the C++ programming language standard
developed their own hash table implementations, the prefix “unordered” was used instead of “hash”. The new library has four types of hash tables, differentiated
C++11
Database software
Hash, ISAM and B-tree. Ingres chooses ISAM (Index Sequential Access Method) as the index data structure by default, but also offers B+ Tree, Hash Table
Ingres_(database)
Set of rules defining correctly structured programs for the Rust programming language
lifetime as prefix): fn remove_prefix<'a>(mut original: &'a str, prefix: &str) -> &'a str { if original.starts_with(prefix) { original = original[prefix.len()
Rust_syntax
General-purpose programming language
coverage and method coverage measurement, and easier Hash transformations with Hash#slice and Hash#transform_keys On top of that come a lot of performance
Ruby_(programming_language)
Divide and conquer sorting algorithm
with K in Θ(log N), as if K is smaller we can sort in O(N) time using a hash table or integer sorting. If K ≫ log N but elements are unique within O(log
Quicksort
Set of file system features
character encoding of a plain-text document, or a checksum, cryptographic hash or digital certificate, and discretionary access control information. In
Extended_file_attributes
Programming language family
programming languages with a long history and a distinctive, fully parenthesized prefix notation. Originally specified in the late 1950s, it is the second-oldest
Lisp_(programming_language)
Algorithm for modelling sequential data
series of models are trained by prefixLM tasks. ("PrefixLM" as in "prefix language modeling" is not "prefixLM" as in "prefix language model".) All transformers
Transformer_(deep_learning)
Open-source blockchain computing platform
are composed of the prefix "0x" (a common identifier for hexadecimal) concatenated with the rightmost 20 bytes of the Keccak-256 hash of the ECDSA public
Ethereum
words, hash all the l-mers using the k-mer of any l-mer as its hash value. All the l-mers that have the same hash value fall into the same hash bucket
Planted_motif_search
Protocol for real-time Internet chat and messaging
and ircs specifies a secure connection. Per the specification, the usual hash symbol (#) will be prepended to channel names that begin with an alphanumeric
IRC
Blockchain computing platform
are composed of the prefix "0x", a common identifier for hexadecimal, concatenated with the rightmost 20 bytes of the Keccak-256 hash (big endian) of the
Ethereum_Classic
Declarative logic programming language
data structures used to store relations; common choices include hash tables and B-trees, other possibilities include disjoint set data structures (for
Datalog
Type of grammar for describing formal languages
string may either match or not match. In case of a match, there is a unique prefix of the string (which may be the whole string, the empty string, or something
Parsing_expression_grammar
Keyword assigned to information
nomenclature. A hashtag is a kind of metadata tag marked by the prefix #, sometimes known as a "hash" symbol. This form of tagging is used on microblogging and
Tag_(metadata)
Equivalence of average-case and expected complexity
of randomness and a fixed error probability can exchange 1-bit hash functions of prefixes of the input to perform a noisy binary search for the first position
Yao's_principle
Microsoft programming language
includes for loops while loops arrays, created with the [| ... |] syntax hash table, created with the dict [ ... ] syntax or System.Collections.Generic
F Sharp (programming language)
F_Sharp_(programming_language)
Shearers" 1525. "Not a Swan on the Lake" 1526. "It Happened On a Day" 1527. "The Hash O' Bennagok" 1528. "The Butcher and the Tailor's Wife" 1529. "Blackwell Merry
List of folk songs by Roud number
List_of_folk_songs_by_Roud_number
Free and open-source object relational database management system
includes built-in support for regular B-tree and hash table indexes, and four index access methods: generalized search trees (GiST), generalized inverted indexes
PostgreSQL
System to identify resources on a network
Resource Records (RRs)," Proposed Standard. RFC 5155 – "DNS Security (DNSSEC) Hashed Authenticated Denial of Existence," Proposed Standard. RFC 5702 – "Use of
Domain_Name_System
1939 novel by James Joyce
"Joyce's delight in reducing man's learning, passion, and religion to a hash is also disturbing." Edwin Muir, reviewing in Listener wrote that "as a whole
Finnegans_Wake
Principal protocol used to assign IPv4 addresses on an IPv4 network
updates by many subsequent RFCs, its definition was replaced in 2018, where prefix delegation and stateless address autoconfiguration were now merged. Internet
Dynamic Host Configuration Protocol
Dynamic_Host_Configuration_Protocol
Scripting language created in 1994
function names was used internally as a hash function, so names were chosen to improve the distribution of hash values. Zeev Suraski and Andi Gutmans rewrote
PHP
Copy-on-write file system
achieved by using a Fletcher-based checksum or a SHA-256 hash throughout the file system tree. Each block of data is checksummed and the checksum value
ZFS
Web application framework
under starting tags or commands ('$' prefix) describe the content or sequence tree structure --> <!-- '.' or '#' prefixes in tags introduce css styled "class"
Yesod_(web_framework)
2019 terrorist attacks in New Zealand
which happened within minutes of notification. Facebook created a digital hash fingerprint to detect further uploads after the video had been propagated
Christchurch_mosque_shootings
Network that allows computers to share resources and communicate with each other
underlying network. Another example of an overlay network is a distributed hash table, which maps keys to nodes in the network. In this case, the underlying
Computer_network
Symbolic description of a mathematical object
using Taylor polynomials. In cryptography and hash tables, polynomials are used to compute k-independent hashing. In the former case, polynomials are evaluated
Expression_(mathematics)
Programming language that uses first order logic
Some Prolog systems, such as WIN-PROLOG and SWI-Prolog, now implement hashing to help handle large datasets more efficiently. This tends to yield very
Prolog
Text in computer source code that is generally ignored by a compiler/interpreter
Pod::List-E<gt>new() Create a new list object. Properties may be specified through a hash reference like this: my $list = Pod::List->new({ -start => $., -indent =>
Comment (computer programming)
Comment_(computer_programming)
filesystem limits are invariably powers of two, so usually expressed with IEC prefixes. For instance, a 1 TiB limit means 240, 10244 bytes. Approximations (rounding
Comparison_of_file_systems
Kushilevitz, Eyal; Lu, Steve; Ostrovsky, Rafail (2012), "On the (in)security of hash-based oblivious RAM and a new balancing scheme", Proceedings of the Twenty-Third
Oblivious_RAM
Commuter rail service in South Florida
Fort Lauderdale and West Palm Beach in Florida, United States. The Tri prefix in the name refers to the three counties served by the railroad: Palm Beach
Tri-Rail
1949 novel by P. G. Wodehouse
has a way with him; he has made an art of the gag and the wisecrack, and hash of realism. … Five—no less than five—scheming aunts preside over the destinies
The_Mating_Season_(novel)
symbol of the pound sterling (£) (GBP) number sign, octothorpe (#) (UK: hash sign) precinct a pedestrian zone in a city or town ("a shopping precinct")
List of words having different meanings in American and British English (M–Z)
List_of_words_having_different_meanings_in_American_and_British_English_(M–Z)
Binary relation over a set and itself
Rodrigues, C. D. J. (2004). Transposing Relations: From Maybe Functions to Hash Tables. Mathematics of Program Construction, 7th International Conference
Homogeneous_relation
General-purpose programming language
manually, e.g., definitions of methods providing for deep comparisons and hashing, and destructuring a case class on its constructor parameters during pattern
Scala_(programming_language)
Package Manager for macOS
supporting five unique modes \ of attack for over 200 highly-optimized hashing algorithms. \ hashcat currently supports CPUs, GPUs, and other hardware
MacPorts
PREFIX HASH-TREE
PREFIX HASH-TREE
PREFIX HASH-TREE
PREFIX HASH-TREE
PREFIX HASH-TREE
PREFIX HASH-TREE
PREFIX HASH-TREE
PREFIX HASH-TREE
PREFIX HASH-TREE