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A logic bomb is a piece of code intentionally inserted into a software system that will set off a malicious function when specified conditions are met. For example, a programmer may hide a piece of code that starts deleting files (such as a salary database trigger), should they ever be terminated from the company.
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The first use of a time bomb in software may have been in 1979 with the Scribe markup language and word processing system, developed by Brian Reid.Reid sold Scribe to a software company called Unilogic (later renamed Scribe Systems [2]), and agreed to insert a set of time-dependent functions (called "time bombs") that would deactivate freely copied versions of the program after a 90-day ...
PyCharm – Cross-platform Python IDE with code inspections available for analyzing code on-the-fly in the editor and bulk analysis of the whole project. PyDev – Eclipse-based Python IDE with code analysis available on-the-fly in the editor or at save time. Pylint – Static code analyzer. Quite stringent; includes many stylistic warnings as ...
The Jerusalem virus is considered to be based on Suriv-3, which is a logic bomb triggered when the date is Friday the 13th, switching off the computer on the 13th. In itself, Suriv-3 is based on its predecessors, Suriv-1 and Suriv-2, which are logic bombs triggered on April 1 ( April Fools' Day ), showing text reading "April 1, ha ha you have a ...
Logic programming is a programming, database and knowledge representation paradigm based on formal logic. A logic program is a set of sentences in logical form, representing knowledge about some problem domain. Computation is performed by applying logical reasoning to that knowledge, to solve problems in the domain.
Constraint logic programming is a form of constraint programming, in which logic programming is extended to include concepts from constraint satisfaction. A constraint logic program is a logic program that contains constraints in the body of clauses. An example of a clause including a constraint is A (X, Y):-X + Y > 0, B (X), C (Y).
These concurrent accesses to the state of the flip-flop operator can lead to undefined behavior, or at least surprising results, depending on the programming language. For example, in Perl each flip-flop operator has its own state, shared among all the threads, [4] the other programming languages do the same.