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It is true that the some prx's are not encrypted. But they are relocatable modules, like Win32 dll's, they cannont execute by themselves. They get loaded by the game when the game needs them (saves on memory). So bunging them in a PBP as DATA.PSP does nothing and trying to run them off the memory st...

Oops, yeh 16 byte == 128 bit, so ignore the bit about 32 byte alignment, just got my maths a bit mixed up. Yeh, I can't see a good reason to include an asymmetric key in the ~PSP file. If each PSP has a public key, surely Sony don't care if its get found or made public, but if someone leaks the priv...

The difference could be explained by any padding that might have been needed for the encryption. (looking at the Wipeout Pure BOOT.BIN and EBOOT.BIN) The size at 0x28 appears to be the original (unencrypted) file size and the size at 0x2C is the encrypted file size. At 0x80 there is that block of 48...