On the surface, putting the same key in 100 million consoles sounds like a security disaster waiting to happen. In hindsight, it was. But in 2005, Nintendo's reasoning was rational:
ebe42a225e8593e448d9c5457381aaf7 Korean Region: 63b82bb4f4614e2e13f2fefbba4c9b7e vWii (Wii U mode): 30bfc76e7c19afbb23163330ced7c28d How to Create the Text File wii common key
Why didn't Nintendo use asymmetric cryptography (public/private keys) for everything? Speed. Decrypting game data on the fly during gameplay requires blistering speed. AES-128 symmetric decryption is computationally light and fast. Asymmetric crypto (like RSA) is slow and was reserved for verifying signatures, not bulk data decryption. On the surface, putting the same key in