| key 1. A value used to identify a in a database, derived by applying some fixed function to the record. The key is often simply one of the (a if the database is considered as a table with records being rows, see ""). Alternatively the key may be obtained by applying some function, e.g. a , to one or more of the fields. The set of keys for all records forms an . Multiple indexes may be built for one database depending on how it is to be searched. 2. A value which must be fed into the used to decode an encrypted message in order to reproduce the original . Some encryption schemes use the same (secret) key to encrypt and decrypt a message, but uses a "private" (secret) key and a "public" key which is known by all parties. (1997-04-26) |
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