يسمى نظام التشفير الذي يستخدم مفتاح واحد للتشفير وفك التشفير
الإجابة هي: التشفير المتماثل.
يُسمى نظام التشفير المتماثل، الذي يستخدم مفتاحًا واحدًا للتشفير وفك التشفير بالتشفير. ويُعد هذا النظام من أبسط تقنيات التشفير وأكثرها شهرة، حيث يستخدم نفس المفتاح للتشفير وفك التشفير. ويُنصح باستخدام هذا النظام في الاتصالات القصيرة المستخدمة في حالات الطوارئ، ولكن يجب الحرص على حماية مفتاح التشفير، حيث أي شخص يحصل عليه قد يتمكن من فك التشفير والوصول إلى المعلومات المشفرة. لذلك، يُنصح بتغيير المفتاح بشكل دوري لتحسين مستوى الأمان.
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