PSP EBOOT signing is the most significant development in PSP homebrew to date. As a result, homebrew now works on official PSP firmwares without the need for any modification on the PSP.

It effectively defeats all of Sony's built in code protections, and is pretty much impossible for them to patch over (as doing so would prevent actual PSP games from running). It marks a magnificent victory (but also closure) to the glorious successes of the PSP Homebrew scene.

The PSP root keys were captured as part of Geohot's momentous discovery of a method to obtain the the root keys of the once-uncrackable PS3. It caused a huge legal war by Sony against the modding scene as they rushed to censor the results.

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4koma explaining the PS3 Root Key situation (drawn by mAn, source: Chinese Engadget)

Chinese (Taiwan) to Japanese Translation

English Translation

Wololo.net - Clarifying the confusion on PS3 development

By adapting the method used to obtain the PS3 root keys, Mathieu managed to obtain the PSP keys.

A record of his initial discovery can be found here.

• PSCrypter - Sign EBOOTs from any PSP! PSCrypter is itself signed, so even OFW PSPs can use it. - DOWNLOAD - AUTHOR: carlosgs (based on bbgtp's PRXCrypter) - SOURCE CODE (source code in a subfolder)

• PRXCrypter ~ 2012-09-21 - Decrypts and signs useful PRX modules, like the original PS3 version. Used in the past for playing newly encrypted PSP games on older versions. - DOWNLOAD - AUTHOR: Rahim-US, bbtgp

• Wololo.net - PS3 Packages and how it leads to PSP signing
• GBATemp - How to run ISO/EBOOT.PBP without hacking