PS3 File Decryption

Discussion in 'PS3 - Hacking & Homebrew' started by Dr.Razor, Dec 24, 2011.

Dec 24, 2011

PS3 File Decryption by Dr.Razor at 7:21 PM (459 Views / 0 Likes) 1 replies

  1. Dr.Razor
    OP

    Member Dr.Razor GBAtemp Regular

    Joined:
    Oct 25, 2008
    Messages:
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    Country:
    Switzerland
    Hey,

    Would it be possible to find out enrcyption keys if you have both encrypted and decrypted files?
    It seems that some files on 3.55 dev_flash aren't modified in 4.00 dev_flash.
    For example, the file "ps2_emu.self"
    If we decrypt those files from 3.55, we would have decrypted and encrypted files, Could we find the keys?

    I'm studying physics so I'm not really aware of decryption algorithm =)
     
  2. FAST6191

    Reporter FAST6191 Techromancer

    pip
    Joined:
    Nov 21, 2005
    Messages:
    21,745
    Country:
    United Kingdom
    If sony have done it right then no. It might have helped if we lacked the public keys but nothing special otherwise.

    If you do fancy looking things up a bit more then the term you probably want is "known plaintext" attack. It is more of a problem with symmetrical encryption (that is to say it defeats it entirely) and some of the black box/oracle stuff but asymmetric encryption (like the elliptical stuff the PS3 uses and you probably want here).

    As for studying physics some of the best pure computer programmers I know come from maths and physics backgrounds (their use of APIs and similar concepts as well as programming style tends to leave a bit to be desired but hey).
     

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