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Topic: N-Hash

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Hash function - Wikipedia, the free encyclopedia Hash functions that are truly random with uniform output (including most cryptographic hash functions) yield good performance because, on average, only one or two probes will be needed (depending on the load factor). Hash functions that are one-to-one are also called randomization functions, though more typical hash functions have a domain larger than their range (and are therefore not one-to-one). A hash function or hash algorithm is a function for summarizing or probabilistically identifying data. en.wikipedia.org /wiki/Hash_function   (1292 words)

Cryptographic hash function - Wikipedia, the free encyclopedia Such file hashes are often the top hash of a hash list or a hash tree which allows for additional benefits. A typical use of a cryptographic hash would be as follows: Alice poses to Bob a tough math problem and claims she has solved it. In cryptography, a cryptographic hash function is a hash function with certain additional security properties to make it suitable for use as a primitive in various information security applications, such as authentication and message integrity. en.wikipedia.org /wiki/Cryptographic_hash_function   (1460 words)

AspEncrypt.com - Crypto 101: One-way Hash Function A one-way hash function, also known as a message digest, fingerprint or compression function, is a mathematical function which takes a variable-length input string and converts it into a fixed-length binary sequence. Furthermore, a one-way hash function is designed in such a way that it is hard to reverse the process, that is, to find a string that hashes to a given value (hence the name one-way.) A good hash function also makes it hard to find two strings that would produce the same hash value. Since it is computationally infeasible to produce a document that would hash to a given value or find two documents that hash to the same value, a document's hash can serve as a cryptographic equivalent of the document. www.aspencrypt.com /crypto101_hash.html   (307 words)

Hash Functions The hash value should be small enough to be manageable in further manipulations, yet large enough to prevent an attacker from randomly finding a block of data that produces the same hash. Therefore, it's important that the hash function be irreversible - not only should it be nearly impossible to retrieve the original data, it must also be unfeasible to construct a data block that matches some given hash value. Since the hash function is irreversible, obtaining the hash values doesn't reveal the passwords to an attacker. www.freesoft.org /CIE/Topics/142.htm   (713 words)

.:: General Purpose Hash Function Algorithms - By Arash Partow ::. When algorithms which contain hash functions are analyzed it is generally assumed that hash functions have a complexity of O(1), that is why look-ups for data in a hash-table are said to be of O(1) complexity, where as look-ups of data in maps (Red-Black Trees) are said to be of O(logn) complexity. It is a simple hash function using a strange set of possible seeds which all constitute a pattern of 31....31...31 etc, it seems to be very similar to the DJB hash function. An empirical result which demonstrated the distributive abilities of the hash algorithm was obtained using a hash-table with 100003 buckets, hashing The Project Gutenberg Etext of Webster's Unabridged Dictionary, the longest encountered chain length was 7, the average chain length was 2, the number of empty buckets was 4579. www.partow.net /programming/hashfunctions   (1406 words)

Q94: What is a Hash Function? Hash functions with just this property have a variety of general computational uses, but when employed in cryptography the hash functions are usually chosen to have some additional properties. Since hash functions are generally faster than digital signature algorithms, it is typical to compute the digital signature to some document by computing the signature on the document's hash value, which is small compared to the document itself. A hash function H is a transformation that takes a variable-size input m and returns a fixed-size string, which is called the hash value h (that is, h = H(m)). www.x5.net /faqs/crypto/q94.html   (311 words)

Managing Hash Clusters The tables in the hash cluster are primarily static in size so that you can determine the number of rows and amount of space required for the tables in the cluster. The implications for altering a hash cluster are identical to those for altering an index cluster, described in "Altering Clusters". HASH IS clause is specified, Oracle uses an internal hash function. www.stanford.edu /dept/itss/docs/oracle/9i/server.920/a96521/hash.htm   (2197 words)

Class: Hash Hashes have a default value that is returned when accessing keys that do not exist in the hash. The order in which you traverse a hash by either key or value may seem arbitrary, and will generally not be in the insertion order. Returns a new hash containing the contents of other_hash and the contents of hsh, overwriting entries in hsh with duplicate keys with those from other_hash. www.ruby-doc.org /core/classes/Hash.html   (1861 words)

A Hash Function for Hash Table Lookup Most of the two dozen old hashes I've replaced have had owners who wouldn't accept a new hash unless it was a plug-in replacement for their old hash, and was demonstrably better than the old hash. This is the speed assuming the hash is inlined in a loop that has to walk through all the characters anyways, such as a tokenizer. This is the same as the additive hash, except it has a mixing step (a circular shift by 4) and the combining step is exclusive-or instead of addition. burtleburtle.net /bob/hash/doobs.html   (2948 words)

Perfect Hashing Hashing 4 keys takes up to 8 instructions, three take up to 4, two take up to 2, and for one the hash is always "return 0". Hash values will be in 0..n-1, where n the smallest power of 2 greater or equal to the number of keys. If the hash is good, the probability of success depends only on the size of the ranges of A and B compared to the number of keys. burtleburtle.net /bob/hash/perfect.html   (2077 words)

Hash House Harrier Information Hashing is an exhilaratingly fun combination of running, orienteering, and partying, where bands of harriers and harriettes chase hares on eight-to-ten kilometer-long trails through town, country, jungle, and desert, all in search of exercise, camaraderie, and good times. Hashing is one of the few social activities left where men and women don't spend 90% of their time worrying about the sexual or political implications of what they just said - or did. The "Hash House" was the mildly derogatory nickname given (for its unimaginative, monotonous food) to the Royal Selangor Club Chambers in Kuala Lumpur by the British civil servants and businessmen who lived and dined there between the two World Wars, when it had become something of a social center of the times. www.half-mind.com /Hashing/who.htm   (11089 words)

What is hashing? - A Word Definition From the Webopedia Computer Dictionary The hash is substantially smaller than the text itself, and is generated by a formula in such a way that it is extremely unlikely that some other text will produce the same hash value. A hash value (or simply hash), also called a message digest, is a number generated from a string of text. Hashing is also a common method of accessing data records. www.webopedia.com /TERM/h/hashing.html   (276 words)

Burlington, Vermont Hash House Harriers The hash is a cross country trail set by one or two volunteers, known as the hares. "Hashing" is the act of participating in the hash. As being the newest hash in the Greater Burlington area, we pride ourselves on having a party-like atmosphere at every hash. www.burlingtonhash.com   (231 words)

Maresware software for computer forensics, data analysis--program titles G-K Hash values of files are commonly used to verify the state of a file at a certain time. Also of interest is the file HASH FAQS which provides information on the hashing algorithms, and methods of using the programs. Hash is designed to calculate a 32 bit CRC, 128 bit MD5 hash, 160 bit Secure Hash Algorithm (SHA1), or the SHA2 (256, 384 or 512 bit) of a file. www.dmares.com /maresware/gk.htm   (1088 words)

Hash functions. This is straightforward enough to do, by accepting the "hash" value as a parameter, and initializing it with some non-zero constant (since the point is to assume that the length is not available until all the data is read). You initialize it, by initially setting hash to some constant (like 0, or some other number if you want to avoid 0 sinking) and you keep it going by feeding the incremental output of each call into the hash parameter of each successive call. I then subjected all realistic sub-bit patterns of the hash output to a simple statistical test and verified that it had a distribution equivalent to a uniformly random map. www.azillionmonkeys.com /qed/hash.html   (2097 words)

hash function Hash functions for strings (C) and (C and Perl). Arash Partow's hash functions (C, C++, Pascal, Java). A fast, parameterizable, broadly applicable hash function (C) including code for and evaluations of many other hash functions. www.nist.gov /dads/HTML/hash.html   (188 words)

Hash Function It is important for a Hash Function to minimize collisions, where a collision is defined as two different arguments that hash to the same value. A Hash Function is a Unary Function that is used by Hashed Associative Containers: it maps its argument to a result of type This is why Hashed Associative Containers are parameterized by the hash function: no one hash function is best for all applications. www.sgi.com /tech/stl/HashFunction.html   (308 words)

16. Hash Tables A hash table is a Lisp object that can efficiently map a given Lisp object to another Lisp object. Also, adding a value to a hash table is a destructive operation; the hash table is modified. The basic functions that deal with hash tables can create entries, delete entries, and find the value that is associated with a given key. www.cs.cmu.edu /Groups/AI/html/cltl/clm/node154.html   (552 words)

Lynchburg Hashers - Seven Hills Hash House Harriers The chase typically concluded at a local pub, or “hash house” (named for their lackluster food), where the traditions of the Hash House Harriers began. The objective of the hash is to have fun, survive, catch the hares and find the finish. “Hashing” began in 1938 in Kuala Lumpur (Malaysia) where a group of British expatriates enjoyed playing “paper chase” or the “hounds and hares” game. 7h4hash.com   (370 words)

ref_h-l.htm You can set the hash property at any time, although it is safer to set the href property to change a location. If the hash that you specify cannot be found in the current location, you will get an error. Setting the hash property navigates to the named anchor without reloading the document. wp.netscape.com /eng/mozilla/3.0/handbook/javascript/ref_h-l.htm   (7057 words)

SparkNotes: Hash Tables: Another use of hashing: Rabin-Karp string searching These two hash values are the same, so we need to do a string comparison between "bca" and "cab". The nice thing about the hash function we used is that it has some properties which allow us to do this. In other words, to go from the hash of a substring in the text string to the next hash value only requires constant time. www.sparknotes.com /cs/searching/hashtables/section4.rhtml   (1113 words)

hash<T> hash is a Hash Function; it is used as the default hash function by all of the Hashed Associative Containers that are included in the STL. That is, the type of object that is being hashed. 's members are defined in the Hash Function requirements. www.sgi.com /tech/stl/hash.html   (183 words)

This is the Home Page of the Atlanta Hash House Harriers and Harrettes Founded in 1982, the Atlanta Hash was the first hash to hit the great state of Georgia, and we've given birth to many other chapters near and far. One element of hashing that doesn't get much love (compared to shiggy and down-downs, that is) is the poor li'l hash song. At one of our fine hashes, which generally meet each Saturday at 1:30PM, you can expect to find a somewhat challenging cross-country trail, which will be marked in biodegradable flour - you know, the stuff Grandma uses to make cookies. www.atlantahash.com   (1087 words)

Half-Mind Catalog: Information & Resources for Hash House Harriers Hash House Harriers Hash House Harriers Hash House Harriers Hash House Harriers Hash House Harriers Hash House Harriers Hash House Harriers Hash House Harriers Half-Mind Half-Mind Half-Mind Half-Mind Half-Mind Half-Mind _ The Half-Mind Catalog offers a wealth of useful hashing information: a worldwide upcoming event calendar, HHH contacts, links to the best hashing websites, a discussion forum, haberdashery goodies for harriers and harriettes, interesting articles and editorials on hashing and hashers, hash humor, history, hints and how-tos, songs, and entertainment. the best point of entry for hashing seems to be www.half-mind.com. www.half-mind.com   (195 words)

The World Hash House Harriers Home Page The Hash House Harriers is a more social version of Hare and Hounds, where you join the pack of hounds (runners) to chase down the trail set by the hare or hares (other runners), then gather together for a little social activity known as the On In or Down Down. Because the GT links to other pages of interest and to local Hash House Harrier group pages as a courtesy to our readers, we may link to pages which have links to pornography or illegal activities for which we have no control. This is an abridged version of this major hash reference which includes history, stories, trail marking ideas and more. www.gthhh.com   (882 words)

H [Security] An algorithm used to produce a hash value of some piece of data, such as a message or session key. A fixed-size result obtained by applying a mathematical function (the hashing algorithm) to an arbitrary amount of data. A set of functions used to create and destroy hash objects, get or set the parameters of a hash object, and hash data and session keys. msdn.microsoft.com /library/en-us/secgloss/security/h_gly.asp   (265 words)

The Old New Thing : Understanding hash codes For example a perfect hash can be produced for the keywords of the C programming language, but not for all of the identifiers that will be used in all of the C programs that will be written during the next 50 years. For instance, 100K entries in a 32-bit hash space is a density of less than 0.01%, but the chances of at least one hash collision are nearly 70%. There are lots of perfect hashing algorithms that don't result in the original string and do produce something considerably smaller than the original string. blogs.msdn.com /oldnewthing/archive/2005/08/31/458432.aspx   (2041 words)

Hashes in Kansai and Japan Hokkaido H3 Hashing free in the wilds of Hokkaido, are the Hokkaido H3. Occasionally "Hash Alerts" are called, and at least three times a year, the Samurai sponsors overnighters that take advantage of the natural beauty of Japan. Ibaraki Hash House Harriers is a new mixed hash in Tsukuba, 1 hour from Tokyo in beautiful country. www.kobehash.com /hashlist.htm   (1660 words)

Hash Salting the password before hashing it makes it virtually impossible to launch a successful dictionary style attack against the hashed password values stored in the database because an attacker would have to try all of the possible salt values for each hash value in their dictionary. There is no known way to reverse a hash, so if your user forgets their password, you cannot email it to them, you have to come up with another way to authenticate the user (secret questions is one good way), in order to reset the password. I think hashing is a very good technique for making it more difficult for attackers to get data, but I've seen developers lean on this as a crutch thinking their passwords are safe. www.petefreitag.com /item/270.cfm   (937 words)

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