ty and integrity of
n., A binary code attached to a record indicating the time that an event occurred, such as creation, receipt, reading, modification or deletion. [Computer and Information Sciences] 
n., Extra data appended to a message which identifies and authenticates the sender and message data using public-key encryption.
n., (DVD) A type of single- or double-sided, optical digital medium that is capable of storing from 4.7 to 8.5 gigabytes of digital data on two continuous, microscopic, spiral track