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Liquid Crystal Display. Light-Emitting Diode A Diode which emits light, <gasp>. Does exactly what it says on the 'tin'. A legacy system is a hardware and software system which uses technologies which are 'old' in comparison with today's technology. Typically, legacy systems use character terminals (although many have been made to look smarter by enabling access through a Graphical User Interface), and process data through a proprietary database etc. When a system is 'in production' or is said to be 'live', it means that it is being used to process active work or transactions, and it is no longer in test mode. Organizations should always differentiate between and separate systems which are being evaluated, tested, or developed from those which are 'live'. A home or office network operated within one location. This may comprise one or more adjacent buildings, but a local network will normally be connected by fixed cables or, more recently, short range radio equipment. A LAN will not use modems or telephone lines for internal communications, although it may well include such equipment to allow selected users to connect to the external environment. A technique used to prevent unauthorized changes to file contents, also known as 'Read Only'. Typically a document - for example a disciplinary letter to a member of staff, - will be created and then 'locked' with a password. Other authorized users will be able to view the contents and even make copies, but only the originator of the document has the password needed to gain access to change the content. Technique used to stop an (apparently) unauthorized attempt to gain access to the system. A typical example is the three tries limit on password entry. It may be a simple matter of a genuine user forgetting their ID and password, or making a mistake in trying to enter, but after three attempts, the system will Lockout that user and report an attempted intrusion to the Security Administrator. Information Security will have to reset the user records to allow another logon attempt. The process of recording events at the time that they occur. The processes by which users start and stop using a computer system. Also known as Slag Code and commonly associated with Disgruntled Employee Syndrome, a Logic Bomb is a piece of program code buried within another program, designed to perform some malicious act. Such devices tend to be the province of technical staff (non-technical staff rarely have the access rights and even more rarely the programming skills required) and operate in two ways:- Logic Bombs demonstrate clearly the critical need for audit trails of activity on the system as well as strict segregation of duties and access rights between those staff who create systems - analysts, developers, programmers, - and the operations staff who actually run the system on a day-to-day basis. Logical access refers to the connection of one device or system to another through the use of software. The software may run, say as the result of a user powering a PC, which then executes the login sequence, or it may be the result of internal processing between systems. Logical Security Software safeguards of the organization's systems, for instance: IDs, Passwords, Access Rights, Authority levels, etc. -------------------------------- |
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