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Hardening (computing) - Wikipedia

https://en.wikipedia.org/wiki/Hardening_(computing)

Learn to Harden your Linux

"Hardening activities include:

Keeping security patches updated

Installing firewall

Closing certain ports

Not allowing file sharing among programs

Installing virus and spyware protection

Using containers or virtual machines

Creating strong passwords

Keeping a backup

Disabling cookies

Using encryption when possible

Disabling weak encryption

"

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