someone who has no reason to be neither liked or disliked. There is nothing special about them nor is there anything hateful about them. Their not racing anyones mind nor are they being criticized. They are just there. Kinda like a hash brown.
by Idknamescausecoool August 26, 2022
Get the The Hash Brown mug.A sexy young man. He's very tall and gives many piggyback rides. He's super cool to talk to, and owns a badass Mustang. He enjoys Starbucks with his white girl friends. He's funny and occasionally makes 9/11 jokes every once in a while. ALLAHU AKBAR
by spaghetti o's June 26, 2016
Get the Hashim mug.A "hash" is a generic term for a bit of software that - given the same input - will produce the same output, and where the input cannot be reconstructed by looking at the output. For example, given the input of "23" a very simple hash would be "5" (adding them together). In this case you cannot reconstruct "23" by analysing "5" because other inputs will also equal "5" ("41", for example). Although you cannot reconstruct the input, you can verify that the input matches the hash.
The use of hashes in applications is typically used to store passwords because if the password database is stolen and your inputs (passwords) are hashed then the thief can’t feasibly reconstruct the input (the original passwords) and use them in the future. So as well as the thief not having anything useful, it means you don’t need to tell all the customers to change their passwords. Because you're only storing the hash of a password this does mean you can’t tell customers what their password is – you can only change it.
When two inputs make the same output in a hash this is called a collision. Just before "23" was hashed as "5" but "41" would also be "5". Collisions in hashes are to be expected; a mere collision is no big deal. However the output of a good hash is also supposed have some other properties – if a good hash produces a value between 0000 and 9999 it shouldn’t produce twice as many outputs between 8000-9999 – the output should be equally distributed across the output space. Also, a good hash given the input "password" and "pbssword" (which vary by only a single letter) should produce very different outputs. This should apply to all inputs, not just typical inputs.
For example, "password" in the MD5 hash is 5F4DCC3B5AA765D61D8327DEB882CF99. Whereas "pbssword" is 65ADD8ADCD26EA1AF12B05F67FD50B97.
This change in output is important because if I already know 5F4DCC(...) as being the hash of "password" this shouldn't help me work out that 5F4DCB(...) came from an input near the word "password".
Finally, a good hash should make it computationally infesible to construct a possible input. If a hash's output varies only between 1 and 9 then generating a possible input is easy, so this is not a good hash. Good hashes like SHA-1 would take years of computer time to construct a possible input (as currently known). Unless you're a crypto scientist use an established and researched hash.
When using hashes in your applications it's important to remember that hashes are repeatable (given the same input you'll get the same output) and that there are precalculated databases of hashes and popular inputs (popular passwords, english words, etc - and their resulting hashes). These databases could be used for good or bad, but as you're hashing your passwords in the first place you'll be wanting to defeat these databases.
One method of defeating such databases is by salting your input. For example, before hashing the word "password" you might combine "salted" so as to get "saltedpassword" -- producing a hash that the precalculated database is less likely to have (it'll have the hash for "cat" but it's less likely to have "saltedcat"). You can either add your salt at the beginning, or intermingle your letters. You may even decide to add specific bytes onto your input so your salt isn't English. Salting could be done application-wide, or per-user (have a salt column in your user table).
Popular hashes are MD5, SHA-0, and SHA-1. Recently MD5 and SHA-0 were shown to be significantly easier to computationally
So use SHA1 (or greater) as your hash and keep an eye out for recently discovered flaws in hashing algorithms. And as hashes vary in length be sure that your database doesn't truncate your good work in protecting passwords.
The use of hashes in applications is typically used to store passwords because if the password database is stolen and your inputs (passwords) are hashed then the thief can’t feasibly reconstruct the input (the original passwords) and use them in the future. So as well as the thief not having anything useful, it means you don’t need to tell all the customers to change their passwords. Because you're only storing the hash of a password this does mean you can’t tell customers what their password is – you can only change it.
When two inputs make the same output in a hash this is called a collision. Just before "23" was hashed as "5" but "41" would also be "5". Collisions in hashes are to be expected; a mere collision is no big deal. However the output of a good hash is also supposed have some other properties – if a good hash produces a value between 0000 and 9999 it shouldn’t produce twice as many outputs between 8000-9999 – the output should be equally distributed across the output space. Also, a good hash given the input "password" and "pbssword" (which vary by only a single letter) should produce very different outputs. This should apply to all inputs, not just typical inputs.
For example, "password" in the MD5 hash is 5F4DCC3B5AA765D61D8327DEB882CF99. Whereas "pbssword" is 65ADD8ADCD26EA1AF12B05F67FD50B97.
This change in output is important because if I already know 5F4DCC(...) as being the hash of "password" this shouldn't help me work out that 5F4DCB(...) came from an input near the word "password".
Finally, a good hash should make it computationally infesible to construct a possible input. If a hash's output varies only between 1 and 9 then generating a possible input is easy, so this is not a good hash. Good hashes like SHA-1 would take years of computer time to construct a possible input (as currently known). Unless you're a crypto scientist use an established and researched hash.
When using hashes in your applications it's important to remember that hashes are repeatable (given the same input you'll get the same output) and that there are precalculated databases of hashes and popular inputs (popular passwords, english words, etc - and their resulting hashes). These databases could be used for good or bad, but as you're hashing your passwords in the first place you'll be wanting to defeat these databases.
One method of defeating such databases is by salting your input. For example, before hashing the word "password" you might combine "salted" so as to get "saltedpassword" -- producing a hash that the precalculated database is less likely to have (it'll have the hash for "cat" but it's less likely to have "saltedcat"). You can either add your salt at the beginning, or intermingle your letters. You may even decide to add specific bytes onto your input so your salt isn't English. Salting could be done application-wide, or per-user (have a salt column in your user table).
Popular hashes are MD5, SHA-0, and SHA-1. Recently MD5 and SHA-0 were shown to be significantly easier to computationally
So use SHA1 (or greater) as your hash and keep an eye out for recently discovered flaws in hashing algorithms. And as hashes vary in length be sure that your database doesn't truncate your good work in protecting passwords.
by holloway August 25, 2004
Get the Hash mug.A girl that has lived and regarded herself as a lesbian, but now is either a bi-girl or straight and no longer gay.
For a period of six years she lived as a Lesbian and had several relationships, now she is simply a Hasbian.
by Michael Pettett May 21, 2006
Get the Hasbian mug.1, n. (sing, pl Hashes) An individual local chapter of the Hash House Harriers or a meeting or run thereof.
2. vb, ptc Hashing, the act of running and drinking with this organisation.
2. vb, ptc Hashing, the act of running and drinking with this organisation.
by Britarse December 18, 2003
Get the Hash mug.by oneman101 November 8, 2019
Get the Hashim mug.Though the word sounds like "Hashish", it is derived from the Japanese number "hachi" which stands for the number "8" in English. The word hachis is generally used by street racers (with little or no knowledge about JDM vehicles) to refer to the famous Toyota Corolla AE-86. A true JDM enthusiast or a real owner of an AE86 would refer to the car as "hachi roku" which means 86, and not just hachis. The Corollas that were produced from 1983 to 1987 and came with 4A-GE engine (+other options) were called AE86 or Hachi Roku.
Mr.Jackass- "I wanna buy a car that drifts well and im thinking of gettin one of those hachis"
Mr.JDM- "Its not hachis you idiot, they are called Hachi Roku. Before you talk about drifting atleast try to name the car right coz an AE86 is a well respected car in the drift world"
Mr.Jackass- "Sorry man.. I heard that name from some wannabe street racers"
Mr.JDM- "Its not hachis you idiot, they are called Hachi Roku. Before you talk about drifting atleast try to name the car right coz an AE86 is a well respected car in the drift world"
Mr.Jackass- "Sorry man.. I heard that name from some wannabe street racers"
by Nobuaki Katayama September 1, 2012
Get the Hachis mug.