3ds Roms Encrypted __full__ Official

| Byte range | Encrypted .3ds | Decrypted .3ds | |------------|------------------|-------------------| | 0x100 – 0x1000 | NCSD header (plain) | Same | | 0x1000 – 0x2000 | High entropy (AES encrypted NCCH header) | Plaintext structure with readable strings (e.g., “ExeFS”) | | File-wide entropy | ~7.99 bits/byte | Lower for RomFS (media files) | | Magic bytes after 0x2000 | Random data | “EXEFS”, “RomFS” |

3dstool -c -t romfs -f romfs.bin -p romfs/ makerom -f cci -target d -rsf rom.rsf -romfs romfs.bin -exefs exefs.bin -o decrypted.3ds 3ds roms encrypted