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How would I go about setting a stronger password for disk encryption on my android device?

I had set a PIN already before enabling full disk encryption, and it proceeded to use that PIN as the decryption string when the device boots.

I understand that switching my PIN / Password will update the decryption string as well, but entering a password every time I unlock the phone is a serious inconvenience. Similarly using a short integer to encrypt the disk leaves it much easier to decrypt.

How do I go about setting a better decryption password, while keeping my PIN? I have no interest in solutions that require rooting the device.

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