The method by which items are placed into, and retrieved from, a file. Each item-id is put through a hashing algorithm that mathematically determines which group in the file to look for, or put, an item. An alternate to the industry-standard ISAM (Incredibly Slow Access Method).
The process in which the position of a record is determined through the use of a mathematical computation to produce an address where the unique key field is stored.
a method of looking up keys that often has complexity O(1), and is based on computing the place to lookup by applying some function to the key value
Hashing is a cryptographic technique to uniquely identify an electronic document.
The production of a "hash value" to ensure that information or software is protected against tampering. An encrypted hash value is created using specific formula that can be used at a later time (e.g. by an end user) to ensure that the transmitted data is the same as when the hash value was created. The advantages of hashing are in the ability to exchange information securely and to detect tampering.
Indexing technique used for quick lookup.
(n.) In managing databases, the process of changing a key ID value to an value, with the intent of reducing search time.
Link sequences are of length log n. Hashing is a method which overcomes the log n barrier. The idea is that the position of a key within the data structure is computed directly from the value of the key.
computing an address to look for an item by applying a mathematical function to a key for that item
An algorithm that generates a unique "checksum" based on the content of transaction data, so that it can be verified by recipients using the same algorithm in reverse to ensure the content was not modified.
Cryptographic technique that is applied over and over (iteratively) to a message of arbitrary length that produces a hash "message digest" or "signature" of fixed length that is appended to the message when sent. In security, used to validate that the contents of a message have not been altered in transit. The Secure Hash Algorithm (SHA-1) and Message Digest 5 (MD5) are commonly used hashes. See also SHA-1 and MD5.
The process whereby a copy of a plain text message is run through a mathematical operation that results in a hash value which is usually 160 bits long. It is computationally infeasible to derive the original message from the hash value.
The conversion of a column primary key value to a database page number on which the row will be stored. Retrieval operations that specify the key column value use the same hashing algorithm and can locate the row directly. Hashing provides fast retrieval for data that contains a unique key value.
(1.) A method of transforming a search key into an address for the purpose of storing and retrieving items of data. (2.) Encoding a character string as a fixed-length bit string for comparison. The encoding may not necessarily be unique.
Hashing means producing hash values, also called digests, for accessing data or for security. A hash value (or digest) is a number generated from a string of text. The hash value 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 result in the same hash value. Hashing can be used to check the integrity of data: if someone produces a hash value and sends it along with the message, the receiver can produce a hash value on receipt of the message. If the receiver's hash matches the one that was sent along with the message, the original message has not been changed.