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S100 User Guide – Rev. D – June 2005 121

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 256-bit based and is a stronger

defense for sensitive material when compared to 40-bit or 128-bit.

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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Symmetricom S100 Manuel d'utilisateur Page 129