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=== DVD discs ===
=== DVD discs ===
The DVDs are encrypted to avoid analysis, and signed to avoid modifications.
The encryption is a symmetric crypto, AES. Symmetric means that the same key is used for both encryption and decryption.
The disc is signed by building SHA-1 hashes of small parts of the disc, then aggregating these hashes into a hierarchical structure, which is finally signed with a asymmetric crypto. This solution is chosen for efficiency, since asymmetric cryptos are extremely slow.
For more details, see [[Wiidisc#Partition_Data|Partition Data info on the Wiidisc page]].
=== Savegames on SD cards ===
=== Savegames on SD cards ===