Encrypting Swap Partition

Since OpenBSD 3.7, swap is automatically encrypted. If you’re using an earlier version and wish to enable encryption, there are two solutions:

Without Rebooting link

To enable swap encryption without rebooting, use the following command:

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sysctl -w vm.swapencrypt.enable=1

With Rebooting link

To enable swap encryption permanently (requires a reboot), edit the /etc/sysctl.conf file and uncomment this line:

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vm.swapencrypt.enable=1