Rootfs disk encryption

does openwrt support /etc/crypttab, i want to use cryptosetup to encrypt full rootfs .

crypttab is not available that early at the boot, due to very epic commonality that 99% of devices have no way to enter crypptab password via keyboard....

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thanks sir, is there any way i can try to encrypt rootfs to avloid somebody reverse my image?

Is the Openwrt config really that sensitive?