Installed your Linux system, you should keep some basic security measures to protect your system
Firewalls, intrusion protection, encryption, data integrity, and
authentication are ways of protecting against such attacks.
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A firewall prevents any direct unauthorized attempts at access.
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Intrusion detection checks the state of your system files to see if they have been tampered with by someone who has broken in.
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Encryption protects transmissions by authorized remote users, providing privacy.
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Integrity checks such as modification digests guarantee that messages and data have not been intercepted and changed or substituted en route.
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Authentication methods such as digital signatures can verify that the user claiming to send a message or access your system is actually that person.
system is also a gateway for a private network, the system's firewall capability can effectively protect the network from outside attacks.
Linux security- the ones with which every user has experience are passwords and file permissions.