Re: VNC authentication weakness

From: Constantin Kaplinsky (constat_private)
Date: Thu Jul 25 2002 - 20:29:21 PDT

  • Next message: Jose Nazario: "Re: VNC authentication weakness"

    >>>>> "JL" == Jack Lloyd <lloydat_private> writes:
    
    JL> While looking at this, I noticed (in 3.3.3r2) that VNC seems to
    JL> use the password directly as a key to DES (truncating if the size
    JL> is > 8 and padding with NULL if it's < 8). Since DES ignores the
    JL> low bit of each byte of the key, this seems to mean that there are
    JL> many different passwords which will be accepted in place of the
    JL> "real" password. (Can someone confirm this is actually the case?)
    
    No, this is not the case. VNC uses modified DES library which ignores
    the most significant bit in each byte, not the least significant. That
    is, 7-bit ASCII characters cannot be confused with each other.
    
    -- 
    With Best Wishes,
    Constantin
    



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