Accounting in .NET

Integrate QR Code ISO/IEC18004 in .NET Accounting
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is useful, because it allows for repeated scrutiny of events to facilitate the discovery of additional security relevant information. Lengths of time to retain event information can vary greatly, from a very brief time to years or even decades. This can have a significant effect on storage requirements, especially when coupled with amount of data captured. If data is only captured for specific security events, the amount of data is much less than if general logs of all routine activities need to be captured. Since we often do not know when a security event occurs until after the fact, logging all activities not just security-related ones is typically required to support later auditing. This is especially true of computer and network activities. The review mechanism supports analysis of the internal representation created by the capture mechanism and, usually but not always, stored by the store mechanism. The review mechanism attempts to establish relationships between the who, what, when, where, why, and how of the event. The review mechanism seeks to accurately describe the event by:
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Verifying the accuracy of what was captured Discerning facts by examining what was captured
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During this analysis, the review function attempts to assert one or more of the following three types of links:
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Actor event link: this establishes a relationship between an actor and some event, and determines the role of the actor in the event. Event asset link: this establishes a relationship between an event and some asset, and that the event was the cause of the effect on the asset. Actor event asset link: this builds on the previous links to establish a relationship between an actor, an event, and an asset. The review mechanism provides some degree of confidence that the actor was present or caused a change in the asset s state.
Two examples of security accounting review mechanisms are audit and intrusion detection system (IDS) analysis (including process signature analysis). Audit is the review of events stored in logs, sometimes called audit logs or audit trails, to determine inadequacies during operation or non-compliance with policy. Audit specifically scrutinizes information for security relevance. There are some cases in which reviews happen fairly quickly, without storing the captured information outside of current memory. In the case of IDS analysis mechanisms, the goal is quickly to determine the semantic content of data captured on the front end of an IDS capture mechanism. For example, an IDS detects that a new program has started and is beginning to delete files in a directory. This analysis may take a few seconds to determine whether the program is behaving appropriately.
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Accounting 359
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The report mechanism takes information from the review mechanism and delivers it to an accounting user. The user can be human or software. The delivery can be automatic, or initiated by a request from the user. A report can be in the form of a written report, briefing, formatted message, an audible alarm or some other form that is intended to get the attention of someone/something so that corrective actions can take place. Two examples of security accounting report mechanisms are alerts and analysis reports. An alert is an automatically-generated signal used to call the attention of a user to an event. Examples are fixed-formatted messages, electronically-triggered phone calls to a pager, and visual or audible signals. An analysis report can be generated from stored captured events. Typically a user s request for a report first invokes the review mechanism to extract and analyze requested event types, then a report mechanism to present the review results to the user. There is a wide variety of contexts in which security accounting can be used to accomplish a task. This context, together with other factors, will shape the designs of security accounting services. The accounting mechanisms (capture, store, review and report) have constraints on their functionality, depending on how they are being used:
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Only events that relay information that is usable directly or indirectly by the review mechanism should be captured. Capture mechanism may need to provide the ability selectively to include different information threads, depending on the security status of the organization. The storage mechanism needs consideration over the term of storage. When appropriate, long-term repositories should be established for retaining accounting information. The storage mechanism must provide flexible capabilities that are usable by the review and report mechanisms. When review must occur immediately, capabilities that can support near realtime or real-time must be considered. The report mechanism may require the ability to report or send alerts immediately. The report mechanism should be flexible enough to enable human reviewers to create their own reports dynamically.
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The patterns in this chapter were written by a team at the MITRE Corporation consisting of Jody Heaney, Duane Hybertson, Susan Chapin, Ann Reedy, and Malcolm Kirwan Jr. Malcolm Kirwan and Duane Hybertson wrote the introductory material for the chapter, and Duane Hybertson integrated the material into the chapter. Peter Sommerlad provided shepherding comments for the MITRE patterns. Markus Schumacher provided comments on integrating the material into the chapter.
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