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How Do They Enhance Security? With SSH, any kind of authentication, including password authentication, is completely encrypted. However, when password-based logins are allowed, malicious users can repeatedly attempt to access the server. With modern computing power, it is possible to gain entry to a server by automating these attempts and trying combination after combination until the right password is found. Setting up SSH key authentication allows you to disable password-based authentication. SSH keys generally have many more bits of data than a password, meaning that there are significantly more possible combinations that an attacker would have to run through. Many SSH key algorithms are considered uncrackable by modern computing hardware simply because they would require too much time to run through possible matches. How Difficult Is This to Implement? SSH keys are very easy to set up and are the recommended way to log into any Linux or Unix server environment remotely. A pair of SSH keys can be generated on your machine and you can transfer the public key to your servers within a few minutes. To learn about how to set up keys, follow this guide. If you still feel that you need password authentication, consider implementing a solution like fail2ban on your servers to limit password guesses. Firewalls A firewall is a piece of software (or hardware) that controls what services are exposed to the network. This means blocking or restricting access to every port except for those that should be publicly available.

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