хэш-кодирование, профессионализм хэширование способ обеспечения быстрого ключевого доступа к элементам данных; каждый элемент данных хранится с соответствующим ключом, который обрабатывается при помощи некой хэш-функции. Полученное хэш-значение используется как индекс для выбора одной из ряда хэш-групп (hash bucket) в хэш-таблице, содержащей указатели на искомые элементы данных Смотри также: checksum, CRC, hash function, hash table, pseudorandom number, random, random number
(Or "hashing") A scheme for providing rapid access to data items which are distinguished by some key. Each data item to be stored is associated with a key, e.g. the name of a person. A hash function is applied to the item's key and the resulting hash value is used as an index to select one of a number of "hash buckets" in a hash table. The table contains pointers to the original items. If, when adding a new item, the hash table already has an entry at the indicated location then that entry's key must be compared with the given key to see if it is the same. If two items' keys hash to the same value (a "hash collision") then some alternative location is used (e.g. the next free location cyclically following the indicated one). For best performance, the table size and hash function must be tailored to the number of entries and range of keys to be used. The hash function usually depends on the table size so if the table needs to be enlarged it must usually be completely rebuilt. When you look up a name in the phone book (for example), you typically hash it by extracting its first letter; the hash buckets are the alphabetically ordered letter sections. See also: btree, checksum, CRC, pseudorandom number, random, random number, soundex.