hash collisions - ορισμός. Τι είναι το hash collisions
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Τι (ποιος) είναι hash collisions - ορισμός

COMPUTER SCIENCE SITUATION WHERE TWO DATA ELEMENTS SHARE A HASHTAG, CHECKSUM, FINGERPRINT, ETC.
Hash collisions; Hash collision (computer science); Cryptographic hash collision
  • John Smith and Sandra Dee are both being directed to the same cell. Open addressing will cause the hash table to redirect Sandra Dee to another cell.
  • John Smith and Sandra Dee share the same hash value of 02, causing a hash collision.

Hash collision         
In computer science, a hash collision or clash is when two pieces of data in a hash table share the same hash value. The hash value in this case is derived from a hash function which takes a data input and returns a fixed length of bits.
hash collision         
<programming> (Or "hash clash") When two different keys hash to the same value, i.e. to the same location in a {hash table}. ESR once asked a friend what he expected Berkeley to be like. The friend replied, "Well, I have this mental picture of naked women throwing Molotov cocktails, but I think that's just a collision in my hash tables." [Jargon File] (1995-01-23)
hash table         
  • Hash collision by separate chaining with head records in the bucket array.
  • Hash collision resolved by open addressing with linear probing (interval=1). Note that "Ted Baker" has a unique hash, but nevertheless collided with "Sandra Dee", that had previously collided with "John Smith".
  • Hash collision resolved by separate chaining
  • This graph compares the average number of CPU cache misses required to look up elements in large hash tables (far exceeding size of the cache) with chaining and linear probing. Linear probing performs better due to better [[locality of reference]], though as the table gets full, its performance degrades drastically.
ASSOCIATES DATA VALUES WITH KEY VALUES - A LOOKUP TABLE
Hashtable; Hash-table; Hash tables; Hash map; Rehash; Hashmap; Open hashing; Scatter storage; Address-calculation sort; Hash Table; Chaining hash table; Separate chaining; Direct chaining; Collision resolution scheme; External chaining; Load factor (computer science); Hash-Based Indexes; Hash table collisions; Hash table collision; Array hash table; Dynamic-sized hash table; Collision resolution in hash tables

Βικιπαίδεια

Hash collision

In computer science, a hash collision or hash clash is when two pieces of data in a hash table share the same hash value. The hash value in this case is derived from a hash function which takes a data input and returns a fixed length of bits.

Although hash algorithms have been created with the intent of being collision resistant, they can still sometimes map different data to the same hash (by virtue of the pigeonhole principle). Malicious users can take advantage of this to mimic, access, or alter data.

Due to the possible negative applications of hash collisions in data management and computer security (in particular, cryptographic hash functions), collision avoidance has become an important topic in computer security.