Meaning of first field
I believe 0x10001 is the exponent part of the RSA key (65537 is a common exponent for public keys), not a signature type.
TO CONFIRM: xt5 has said on HackMii that offset 0x1F1, with a value of 1, is used in Korean Wiis to use a different common key. Can someone confirm/update? Yes this difference is notable between Korean and non-Korean update partition, this should be the marker --moquette 06:20, 30 August 2008 (UTC)