Appendix B
Time Glossary
Access Control
The mechanisms of limiting entry to resources based on users’ identities and their membership in various predefined groups. The network resources with these access restrictions typically are servers, directories, and files.
ACTS
Automated Computer Time System, a NIST service that provides announced time by telephone.
Advanced Encryption Standard (AES)
Developed by NIST and private companies, this standard is
Algorithm
A clearly specified mathematical process for computation, or set of rules, which, if followed, gives a prescribed result.
ANSI
American National Standards Institute, the organization responsible for approving US standards in many categories, including computers and communications. Standards approved by this organization are often called ANSI standards.
Antiwarrant
Attribute certificate that has the same expire date as its valid date; in other words, it was never valid. This is still sent, at times, because it contains other information that the system needs. See also Warrant
API
Application Program Interface. This interface allows software developers to write their software so that it can communicate with the computer's operating system or other programs.
ASCII
American Standards Code Information Interchange, a code in which each alphanumeric character is represented as a number from 0 to 127, in binary code so the computer can understand it. Its simplicity allows diverse computers to understand one another.
ATM
Asynchronous Transfer Mode, or ATM switching. This is a type of packet switching that makes it possible to transmit data at high speeds over a network. It also allows dynamic
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