ISO17799 and its predecessor, the British Standard #BS7799 were initially developed by the British Standards Institution (BSI) are security policies and standards procedures. Initially called BS7799 in the BSI the standard later became the ISO IEC 17799 standard when it was adopted by the ISO IEC technical committee for international use.
Glossary
GLOSSARY: Passive Digital Content
Passive Digital Content is that content which does not require an ongoing source of energy to continue existing. Passive Digital Content is information outside of a computer. It is contained in digitally and human readable forms. It (Passive Digital Content) can be the data represented as reports or physical media exchanged from one system to another […]
Glossary
GLOSSARY: Active Digital Content
Active Digital Content is that content which is ephemeral in that it exists because of an ongoing source of energy. Active Digital Content is then information inside of a computer or some active display device like a browser or viewer appliance. It can be translated to a paper form which makes it passive or other visual report on a display […]
Glossary
GLOSSARY: Drift
No two clocks, no matter how precise, will keep the same time (especially if you are measuring time down to the nanosecond). Assuming two clocks are synchronized at a point in time, drift is the difference in time between the two clocks after the initial time setting. In mechanical clocks, drift is caused by changes in […]
Glossary
GLOSSARY: Universal Time Coördinated (UTC)
Coördinated Universal Time (UTC)[1] (French: Temps Universel Coordonné) is a time standard based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the Earth’s slowing rotation.[2] Leap seconds are used to allow UTC to closely track UT1, which is mean solar time at the Royal Observatory, Greenwich. The difference between […]
Glossary
Glossary: UDP (UDP/IP networking protocol)
UDP or the User Datagram Protocol is the protocol used by NTP for the communication of time over networks through port 123. Unlike TCP (Transmission Control Protocol), UDP is a simple protocol that does not set up any “handshaking” such as error correction between systems on a network. Without the handshaking overhead, UDP transmissions suffer less problems […]
Glossary
GLOSSARY: Traceability
Traceability is the concept that a measurement must be traceable back to an agreed upon standard of equal or greater accuracy. For example, if a manufacturer produces bolts that are 2 inches in diameter and warrants that each bolt will only vary by only 1⁄16th of an inch, the manufacturer should be able to trace the measurement and […]
Glossary
GLOSSARY: TAI
TAI is the the International Atomic Time scale, which is a statistical timescale based on a large number of atomic clocks. Atomic Time is kept within Atomic Clocks operated in various laboratories and devices around the Earth. TAI time sources are generally Atomic Clocks or Hydrogen Ion Gas Masers operated in timing laboratories around the globe. These precisely […]
Glossary
Glossary: Stratum (NTP Stratum)
“Stratum” is the term used to describe the hierarchical structure used to deploy time over a network. Time servers using NTP are typically deployed in a hierarchical network structure for several reasons. One is to assure that there is a central clock or standard for time from which all other devices on the network are set (i.e. Stratum […]
Glossary
GLOSSARY: Software Clock
Software clocks are ones implemented as programs which run inside various devices and operating systems. Software clocks are generally based on some number of ‘kernel ticks’ which make up the time-slices of the computers context for a Second of services. Software clocks are constrained by interrupt latency and other factors like memory, process loading, other high-priority […]