وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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عبارة عن شيفرة برمجية خبيثة عادةً يتم وضعها بشكل سري ومتعمد في شبكة حاسوبية أو نظام تشغيل أو تطبيق برمجي لإلحاق الضرر به، ويتم تفعيلها بناءً على شرط معين مثل سلوك أو حدث ما أو وقت وتاريخ محدد.
تُلحق القنبلة المنطقية الأذى بالأنظمة المختلفة عن طريق تخريب البيانات أو حذف الملفات أو مسح محتوى الأقراص الصلبة. وتتجلى خطورتها بعدم إمكانية كشفها إلا بعد أن يتم تفعيلها. وعلى الرغم من أن القنابل المنطقية تستخدم عادةً لأغراض خبيثة إلا أن لها استخدامات أخرى مثل منع الوصول المجاني إلى الخدمات في البرمجيات التجريبية بعد انقضاء فترة محددة.
يمكن تصنيف المحفزات التي تؤدي إلى تفعيل القنبلة المنطقية إلى إيجابية وسلبية؛ حيث تعمل القنابل المنطقية ذات المحفزات الإيجابية بعد تحقق شرطها مثل انقضاء موعد محدد أو فتح برنامج معين. أما القنابل المنطقية ذات المحفزات السلبية فتعمل عند عدم تحقق شرطها مثل الفشل في إدخال رمز التفكيك قبل وقت محدد. وعلى عكس البرمجيات الخبيثة الأخرى التي تصيب الأنظمة من تلقاء نفسها مثل الفيروسات والديدان، تحتاج القنابل إلى شخص من داخل النظام ويملك معرفة به.
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