Quote:prxdecrypter (psardumper mod to decrypt PRX files and firmware resources)
version 1.5
by jas0nuk

***
This mod of psardumper can decrypt/decompress:
* individual firmware modules from all known retail firmwares (1.00-3.52)
* modules and EBOOT.BIN files from all current retail games
* M33 custom firmware modules
* RLZ files extracted from RCOs


CHANGELOG:
1.4b -» 1.5
- More source cleanup and improved error handling: If something fails to decrypt or decompress it saves as much as possible,
` or avoids saving to prevent memory stick corruption. (No more deletion of files for no reason)
- Can decompress plain 2RLZ files in the ms0:/enc folder (extracted from RCOs or whatever)
- Improved method of initializing 2RLZ decompressor - much faster now, and less likely to fail
- Now writes a log of all activities to ms0:/enc/log.txt
- Fixed a bug which prevented the header of extremely small files (less than 208 bytes) being found
- FINALLY: retail game EBOOT.BIN decryption
- Improved M33 PRX detection to reduce false positives
- SHA-1 check removed to allow files such as vshmain.prx from 3.5X to decrypt

Check readme.txt for more instructions.

jas0nuk Wrote:  Here is 1.5b

CHANGELOG:
1.5 -» 1.5b
- Added decryption for:
`-- 1.XX game EBOOT.BIN files
`-- New game EBOOT.BIN types which aren't yet being used (4 different keys)
`-- 6 new unknown filetypes in mesg_led (6 different keys)
`-- DATA.PSP from 2.7X, 2.8X and 3.XX demos (4 different keys)
`-- DATA.PSP from official updaters
`-- 2.50/2.60 meimg.img and me_sdimg.img (2 different keys)
`-- more coming soon
- NOTE: If you want to decrypt a file, make sure it has the 4 byte "~PSP" header, or it will be skipped by the decrypt function. You can easily add this using a hex editor.
- Better checks before attempting to "UnSignCheck" files
- Fixed an incorrect error message
- Fixed a logging bug which logged "fail" and "success" at the same time
- Increased buffers to 10mb each to allow large files to be decrypted

If anything crashes or gives an unknown tag error/output unexpected, PM me and tell me exactly what you were trying to decrypt along with any logs. Thanks


~jas0nuk