We know that it is "real" in the sense that the PSP will actually run it, resulting in display of some text and an option to toast the PSP. Of the two "mystery files", I think UNKNOWN.PSP is the more interresting one. (Of course, there could be some simple obscurity measure as well, like the scrambling used on Dreamcast CD-ROM binaries, but real cryptographic encryption would be a waste of computrons IMO.) Thus, my money is on compression rather than encryption. What would make sense would be cryptographically signing the binary, but that is typically done by just signing a hash of the file contents, so it would not change the data itself. (The PSP could encrypt the file when storing it on the stick, but that does not seem to happen, nor would there be much point.)Īnyway, the benefit from encypting the binary at all would be rather limited since the PSP can run it it would have to contain the decryption key, so anyone who wants it bad enough could get it (remove the flash chip with a hot-air gun and put it in a reader). Also, I think the encryption key for MagicGate is unique for each memory stick, so pre-encryption of a file to be downloaded over the Internet would probably not work. There's a few interviews that say you only need a MagicGate card if you're going to use the card for more than standard game saves.ĪFAIK, MagicGate is for DRM, so it is probably not applicable. OoPo wrote:Looking around at various press releases we can see that the PSP supports two types of encryption: MagicGate and 128bit AES. I've written a program to unpack the PBP files. There's a few interviews that say you only need a MagicGate card if you're going to use the card for more than standard game saves. Looking around at various press releases we can see that the PSP supports two types of encryption: MagicGate and 128bit AES. So, where do we go from here? Well, it would be nice to see if we can decode the PSP and PSAR files. UNKNOWN.PSAR - Maybe an archive, maybe the actual firmware for the updater program to use. It contains the text 'UPDATER' but doesn't appear to be uncompressed or unencrypted. UNKNOWN.PSP - This is most likely an executable file. UNKNOWN.PNG - This is a simple PNG file, most likely used in the main menu to display a picture of what this file does to the user. Their extensions are named by their signatures - three or four letters located at the beginning of each file.
#Compress pbp file update#
They do not have any equivalent in a normal savegame so most likely they contain the update itself. The ones named UNKNOWN are the most interesting. Code: Select all char *filename =
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