NIST SP 800-53 had five modifications at the time of authoring and had over 1,000 controls. This security controls catalog enables federal government agencies to apply the required security and privacy controls for federal information systems and organizations in order to safeguard against cyber assaults. It is a valuable tool for system administrators to understand which controls are needed on their networks before they are attacked.
All NIST security guidelines can be found in this book. It covers all areas of computer security from network security to application security to physical security. The book is very detailed for anyone who wants to learn more about security or administer a networked system.
Each section of the book includes helpful tools that can help you identify vulnerabilities within your network. For example, there is a list of common network attacks with corresponding sections that discuss how to prevent these attacks through basic networking practices and using firewall technology. There are also several useful tables included in the book that summarize commonly used security terms in plain English. For example, one table lists common network protocols along with their associated risks. Another table details different types of firewalls with their advantages and disadvantages.
In addition to the guide, NIST also offers free online training courses related to computer security. These courses cover all aspects of computing technology from mobile devices to virtualization to security.
There are 965 controls. They can be divided into 15 categories listed below.
The first edition of NIST SP 800-53 was published in August 2000. Since then, it has been updated twice - in April 2002 and again in June 2004.
Controls are introduced to prevent unauthorized access to SCADA systems and to ensure their proper operation. They include authentication procedures, user identification lists, authorization rules, activity logs, alarm limits, shutdown procedures, monitoring functions, and error messages.
NIST SP 800-53 provides guidance on how to implement security measures for SCADA systems. It is designed to help organizations assess their SCADA security and identify weaknesses if any. The control also includes references to other standards and literature that may provide further information about the subject.
A list of all controls is included in the appendix of NIST SP 800-53.
Here's a summary of the 15 categories:
3. User Identification
The entire set of all 28 components of IS Code No. 1200, which includes a head tube, a down tube, a top tube, a seat tube, a steerer tube, a fork leg, a front wheel hub, a rear wheel hub, a center spindle, a pedal spindle, a gearbox side plate, and a clutch basket.
The 7400, the initial component number in the series, is a 14-pin IC with four two-input NAND gates. Each gate has two input pins and one output pin, with the other two pins serving as power (+5 V) and ground. The seven remaining pins are for connecting up to seven more 7400s together in a circuit.
In general use, a NAND gate takes two inputs and produces a single output which will be true if and only if both of the inputs are true. The 7400 uses two such gates connected back-to-back so that only one of them needs to produce a true output for the entire unit to do so. This reduces the amount of wiring needed and also allows several functions to be performed within the same package. However, since these gates are not symmetrical, they cannot be used in a simple AND gate configuration without using another device such as an OR gate or buffer (see below).
The 7400 has 14 pins. Therefore, it can perform up to 14 different functions, depending on how it is connected together with other 7400s and external components.
Here are the numbers of gates and factors by which the 7400 could be expanded: 7400 = 14 pins * 1 bit per pin = 98 bits total capacity 8 bits minimum required resolution
Thus, the 7400 has a total capacity of 100 bits.
The numeric code 74 indicates that the chip meets civilian computer industry requirements, being able to operate over a temperature range of to C, whereas the code 54 indicates that the chip can operate over the more extreme temperature range of to C required by many military and industrial applications.
These codes are usually found in the data sheet under specifications. They can be used to identify parts that will operate properly during use. The codes are also useful when repairing damaged equipment because they can help match up similar components. For example, if you were trying to repair a laptop with a broken hard drive, you could replace only the CMOS battery with an identical battery from another laptop that was known to work with its CMOS battery replaced.
The codes are usually placed on one or more of the following areas of the circuit board: the power supply unit (PSU), the motherboard, or the chipset. These are essential items for any computer to function correctly. If they were missing or malfunctioning, the computer would not work at all. However, the codes do not necessarily need to be on these specific locations; they can be anywhere on the circuit board as long as they are visible when looking at it from above.
Computer chips come in various sizes, levels of complexity, and capabilities.