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  Computer system security refers to the protection of computer systems and networks from unauthorized access, theft, damage, or other malicious activities. It involves the implementation of various technologies, practices, and policies to prevent security breaches and protect against cyber threats. Effective computer system security involves several key elements, including: Access control : This involves limiting access to computer systems and networks to authorized users only. Access control measures include the use of passwords, authentication methods such as biometric scanners or security tokens, and limiting access to sensitive information on a need-to-know basis. Encryption : Encryption is the process of encoding data so that it can only be accessed by authorized users. Encryption is used to protect data during transmission and storage, preventing unauthorized access and tampering. Firewalls : A firewall is a security device that monitors and controls incoming and outgoing ne...