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failure access => An unauthorized and usually inadvertent access to data resulting from a hardware or software failure in the system.
failure control => The methodology used to detect and provide fail-safe or fail-soft recovery from hardware and software failures in a system.
family => Grouping of related components that all address the same type of
fault => A condition that causes a device or system component to fail to perform in a required manner.
fetch protection => (1) A system-provided restriction to prevent a program from accessing data in another user's segment of storage. (2) The aggregate of all processes and procedures in a system designed to inhibit unauthorized access, contamination,...
file protection => The aggregate of all processes and procedures in a system designed to inhibit unauthorized access, contamination, or elimination of a file.
file security => The means by which access to computer files is limited to authorized users only.
flaw => An error of commission, omission, or oversight in a system that allows protection mechanisms to be bypassed.
flaw hypothesis methodology => A system analysis and penetration technique where specifications and documentation for the system are analyzed and then flaws in the system are hypothesized.  The list of hypothesized flaws is then prioritized on the ba...
formal => Based upon precise and unambiguous syntax and semantics. -  Human user - A person who interacts with the TOE.
formal development methodology => A collection of languages and tools that enforces a rigorous method of verification.  This methodology uses the Ina Jo specification language for successive stages of system development, including identification and ...
formal model of security policy => an underlying model of security policy expressed in a formal style, i.e. an abstract statement of the important principles of security that a TOE will enforce. 
formal proof => A complete and convincing mathematical argument, presenting the full logical justification for each proof step, for the truth of a theorem or set of theorems.  The formal verification process uses formal proofs to show the truth of ce...
formal specification => Statement about a product made using the restricted syntax and grammar of a formal reasoning system and a set of terms that have been precisely and uniquely defined of specified. Note: The formal statement should be augmented ...
FTLS => Formal Top-Level Specification - A Top-Level Specification that is written in a formal mathematical language to allow theorems showing the correspondence of the system specification to its formal requirements to be hypothesized and formally p...
formal verification => The process of u sing formal proofs to demonstrate the consistency (design verification) between a formal specification of a system and a formal security policy model or (implementation verification) between the formal specific...
formal access approval => Documented approval by a data owner to allow access to a particular category of information.
formal security policy model => A mathematically precise statement of a security policy.  To be adequately precise, such a model must represent the initial state of a system, the way in which the system progresses from one state to another, and a def...
security filter => A security filter, which could be implemented in hardware or software, that is logically separated from the remainder of the system to protect the system's integrity.
functional component => Fundamental building block, specifying what an IT product must be capable of doing, from which functional protection requirements are assembled.
functional package => Grouping of functional components assembled to ease specification and common understanding of what an IT product is capable of doing.
functional protection requirements => Requirements in a protection profile which address what conforming IT products must be capable of doing.
functional testing => The portion of security testing in which the advertised features of a system are tested for correct operation.
functional unit => a functionally distinct part of a basic component.
functionality => The totality of functional properties of a TOE that contributes to security.
functionality class => a predefined set of complementary security enforcing functions capable of being implemented in a Target of Evaluation.
general-purpose system => A computer system that is designed to aid in solving a wide variety of problems.
generic threat => Class of threats with common characteristics pertaining to vulnerabilities, agents, event sequences, and resulting misfortunes=2E
global requirements => Those which require analysis of the entire system and for which separate analysis of the individual TCB (trusted computing base) subsets does not suffice.
granularity => Relative fineness or coarseness to which an access control mechanism or oth- er IT product aspect can be adjusted. Note: Protection at the file level is considered course granularity, whereas protection at the field level is considered...
group => Named collection of user identifiers.
gypsy verification environment => An integrated set of tools for specifying, coding, and verifying programs written in the Gypsy language, a language similar to Pascal which has both specification and programming features.  This methology includes an...
handshaking procedure => A dialogue between two entities (e.g., a user and a computer, a computer and another computer, or a program and another program) for the purpose of identifying and authenticating the entities to one another.
hierarchical decomposition => the ordered, structured reduction of a system or a component to primitives.
hierarchical development methodology => A methodology for specifying and verifying the design programs written in the Special specification language. The tools for this methodology include the Special specification processor, the Boyer-Moore theorem ...
host => any computer-based system connected to the network and containing the necessary protocol interpreter software to initiate network access and carry out information exchange across the communications network. This definition encompasses typical...
identification => The process that enables recognition of an entity by a system, generally by the use of unique machine-readable user names.
impersonating => Synonymous with spoofing.
implementation => a phase of the Development Process wherein the detailed specification of a Target of Evaluation is translated into actual hardware and software.
individual accountability => The ability to associate positively the identity of a user with the time, method, and degree of access to a system.
informal => Expressed in natural language.
informal specification => Statement about (the properties of) a product made using the gram- mar, syntax, and common definitions of a natural language (e.g., English). >Note: While no notational restrictions apply, the informal specification is also ...
information protection policy => Set of laws, rules, and practices that regulate how an IT product will, within specified limits, counter threats expected in the product's assumed operational environment.
ISSO => Information System Security Officer  -  The person responsible to the DAA for ensuring that security is provided for and implemented throughout the life cycle of an AIS from the beginning of the concept development plan through its design, de...
ITSEC => Information Technology Security Evaluation Criteria - European security evaluation criteria for targets of evaluation (TOE).
information flow control => A procedure to ensure that information transfers within a system are not made from a higher security level object to an object of a lower security level.  See covert channel, simple security property, star property (*-prop...
information processing standard => A set of detailed technical guidelines used to establish uniformity to support specific functions and/or interoperability in hardware, software, or telecommunications development, testing, and/or operation.
information protection policy => Set of laws, rules, and practices that regulate how an IT (information technology) product will, within specified limits, counter threats expected in the product's assumed operational environment.
IT => Information Technology - An international term for an information system, which consists of one or more automated information systems (AISs) or computer systems and communications systems.
integrity => a) The property that information or resources are not improperly affected.	b) The  property  that  assumptions  about  the  known  or expected  state  of information or resources remain true.
integrity policy => a security policy to prevent unauthorized users from modifying, viz., writing, sensitive information. See also Security Policy.
interdiction => See denial of service - DOS.
internal security controls => Mechanisms implemented in the hardware, firmware, and soft- ware of an IT product which provide protection for the IT product.
internal subject => a subject which is not acting as direct surrogate for a user. A process which is not associated with any user but performs system-wide functions such as packet switching, line printer spooling, and so on. Also known as a daemon or...
interoperability => The ability of computers to act upon information received from one another.
isolation => The containment of subjects and objects in a system in such a way that they are separated from one another, as well as from the protection controls of the operating system.
IT Security => The state of security in an IT system.
IT System => A specific IT installation, with a particular purpose and operational environment.
key management => A method of electronically transmitting, in a secure fashion, a secret key for use with a secret key cryptographic system. Key management can be used to support communications privacy. This method can be accomplished most securely w...
key escrow system => An electronic means of reconstructing a secret key (for secret key encryption) or a private key (for public key encryption)=2E The reconstructed key can then be used in a process to decrypt a communication.
key => A long string of seemingly random bits used with cryptographic algorithms to create or verify digital signatures and encrypt or decrypt messages and conversations. The keys must be known or guessed to forge a digital signature or decrypt an en...
label => see Security Label and Sensitivity Label.
lattice => A partially ordered set for which every pair of elements has a greatest lower bound and a least upper bound.
least privilege => The principle that requires that each subject be granted the most restrictive set of privileges needed for the performance of authorized tasks. The application of this principle limits the damage that can result from accident, erro...
limited access => Synonymous with access control.
list oriented => A computer protection system in which each protected object has a list of all subjects authorized to access it.  Compare ticket-oriented.
local requirements => Those for which separate analysis of the individual TCB (trusted computing base) subsets suffices to determine compliance for the composite TCB. (See the trusted database interpretation of the Trusted Computer System Evaluation ...
lock and key protection system => A protection system that involves matching a key or password with a specific access requirement.
logic bomb => A resident computer program that triggers the perpetration of an unauthorized act when particular states of the system are realized.
loophole => An error of omission or oversight in software or hardware that permits circumventing the system security policy.
*-property => (Star Property) - A Bell-LaPadula security model rule allowing a subject write access to an object only if the security level of the subject is dominated by the security level of the object.  Also known as the Confinement Property.
star property => A Bell-LaPadula security model rule allowing a subject write access to an object only if the security level of the subject is dominated by the security level of the object.  Also known as the Confinement Property.
machine user => A  machine,  group  of  machines  or  other  logical  entity outside  of  the  TOE  with interacts with the TOE.
magnetic remanence => A measure of the magnetic flux density remaining after removal of the applied magnetic force.  Refers to any data remaining on magnetic storage media after removal of the power.
maintenance hook => Special instructions in software to allow easy maintenance and additional feature development.  These are not clearly defined during access for design specification.  Hooks frequently allow entry into the code at unusual points or...
malicious logic => Hardware, software, or firmware that is intentionally included in a system for an unauthorized purpose; e.g., a Trojan horse.
mandatory access control => A means of restricting access to objects based on the sensitivity (as represented by a label) of the information contained in the objects and the formal authorization (i.e., clearance) of subjects to access information of ...
masquerading => Synonymous with spoofing.
mechanism => Operating system entry point or separate operating system support program that performs a specific action or related group of actions.
metadata => (1) Data referring to other data; data (such as data structures, indices, and pointers) that are used to instantiate an abstraction (such as "process," "task," "segment," "file," or "pipe"). (2) A special database, also referred to as a d...
mimicking => Synonymous with spoofing.
modes of operation => A description of the conditions under which an AIS functions, based on the sensitivity of data processed and the clearance levels and authorizations of the users.
multilevel device => A device that is used in a manner that permits it to simultaneously process data of two or more security levels without risk of compromise.  To accomplish this, sensitivity labels are normally stored on the same physical medium a...
multilevel secure => A class of system containing information with different sensitivities that simultaneously permits access by users with different security clearances and needs-to- know, but prevents users from obtaining access to information for ...
multilevel security mode => the mode of operation that allows two or more classification levels of information to be processed simultaneously within the same system when some users are not cleared for all levels of information present. Compare Dedica...
mutually suspicious => The state that exists between interacting processes (subsystems or programs) in which neither process can expect the other process to function securely with respect to some property. 
NCSC => National Computer Security Center - Originally named the DoD Computer  Security Center, the NCSC is responsible for encouraging the widespread availability of trusted computer systems throughout the Federal Government.
NSDD 145 => National Security Decision Directive 145 - Signed by President Reagan on l7 September l984, this directive is entitled "National Policy on Telecommunications and Automated Information Systems Security." It provides initial objectives, pol...
NTISSD => National Telecommunications and Information System Security Directives - NTISS Directives establish national-level decisions relating to NTISS policies, plans, programs, systems, or organizational delegations of authority. NTISSDs are promu...
NTISSI => National Telecommunications and Information Systems Security Advisory Memoranda/ Instructions - NTISS Advisory Memoranda and Instructions provide advice, assistance, or information of general interest on telecommunications and systems secur...
need to know => (1) Access to, or knowledge or possession of, specific information required to carry out official duties. (2) The necessity for access to, knowledge of, or possession of specific information required to carry out official duties.
network architecture => the set of layers and protocols (including formats and standards that different hardware/software must comply with to achieve stated objectives) which define a Network.
network component => a network subsystem which is evaluatable for compliance with the trusted network interpretations, relative to that policy induced on the component by the overall network policy.
network connection => A network connection is any logical or physical path from one host to another that makes possible the transmission of information from one host to the other. An example is a TCP connection. But also, when a host transmits an IP ...
network reference monitor => an access control concept that refers to an abstract machine that mediates all access to objects within the network by subjects within the network.
network security => the protection of networks and their services from unauthorized modification, destruction, or disclosure. Providing an assurance that the network performs its critical functions correctly and there are no harmful side-effects. Inc...
network security architecture => a subset of network architecture specifically addressing security-relevant issues.
network sponsor => the individual or organization that is responsible for stating the security policy enforced by the network, for designing the network security architecture to properly enforce that policy, and for ensuring that the network is imple...
network system => a system which is implemented with a collection of interconnected network components. A network system is based on a coherent security architecture and design.
NTCB => Network trusted computing base - the totality of protection mechanisms within a network system -- including hardware, firmware, and software -- the combination of which is responsible for enforcing a security policy. (See also Trusted Computi...
network front end => A device that implements the necessary network protocols, including security-related protocols, to allow a computer system to be attached to a network.
nondiscretionary access control => Means of restricting access to objects based largely on administrative actions. (See mandatory access control=2E)
normal operation => Process of using a system.
object => A passive entity that contains or receives information. Access to an object potentially implies access to the information it contains.  Examples of objects are:  records, blocks, pages, segments, files, directories, directory trees, and pro...
object reuse => The reassignment and reuse of a storage medium (e.g., page frame, disk sector, magnetic tape) that once contained one or more objects.  To be securely reused and assigned to a new subject, storage media must contain no residual data (...
open security environment => An environment that includes those systems in which at least one of the following conditions holds true: (l) Application developers (including maintainers) do not have sufficient clearance or authorization to provide an a...
operating procedure => a set of rules defining correct use of a Target of Evaluation.
operation => the process of using a Target of Evaluation.
operational documentation => the information produced by the developer of a Target of Evaluation to specify and explain how customers should use it.
OPSEC => Operations Security - An analytical process by which the U.S. Government and its supporting contractors can deny to potential adversaries information about capabilities and intentions by identifying, controlling, and protecting evidence of t...
orange book => Alternate name for DoD Trusted Computer Security Evaluation Criteria.
OSI => The International Organization for Standardization provides a framework for defining the communications process between systems. This framework includes a network architecture, consisting of seven layers. The architecture is referred to as the...
output => Information that has been exported by a TCB.
overt channel => an overt channel is a path within a network which is designed for the authorized transfer of data.
overwrite procedure => A stimulation to change the state of a bit followed by a known pattern.  See magnetic remanence.
owner => User granted privileges with respect to security attributes and privileges affecting specific subjects and objects.
package => A set of components combined together to satisfy a set of identified objectives.
partial order => A relation that is symmetric (a is related to a), transitive (if a is related to b and b is related to c, then a is related to c), and antisymmetric (if a is related to b and b is related to a, then a and b are identical.)
partitioned security mode => A mode of operation wherein all personnel have the clearance but not necessarily formal access approval and need-to-know for all information contained in the system.  Not to be confused with compartmented security mode.
passive => (1) A property of an object or network object that it lacks logical or computational capability and is unable to change the information it contains. (2) Those threats to the confidentiality of data which, if realized, would not result in a...
password => Protected/private character string used to authenticate an identity or to authorize access to data.