An alternative to encryption for game files?

**blackwyvern** · 03-27-2002

Ok, I am not really sure how to encrypt and decrypt files so would a fair alternative be to give a range of items keys and if the values and keys dont match up then the file will be read corrupt by the game module?
say like this:
if (goldpieces < 50)
{
goldkey = 123476;
};
if ((goldpieces > 50) && (goldpieces < 100)
{
goldkey = 1567830;
};

or something like that?
have all the keys follow the variables that they are supposed to error check for and if they dont match the file is unloadable. I know if they had the source file this would be no good, but if I released just the exe file then I believe it would work. Should I just learn how to encrypt files instead?

**Deckard** · 03-27-2002

Still some room for tampering, I suspect. Consider using a CRC to safeguard your data (www.google.com).

**Deckard** · 03-27-2002

Here's a quick example:

Code:

#define CRC_MAGIC_NUMBER 0x1021

unsigned short Crc16( char* psBuf, int nBufLen )
{
  unsigned short usCrc = 0;
  int            nIdx, nJdx;

  for(nIdx = 0; nIdx < nBufLen; ++nIdx)
  {
    usCrc ^= (psBuf[nIdx] << 8);
    for(nJdx = 8; nJdx; --nJdx)
    {
      usCrc = (usCrc & 0x8000) ? (usCrc + usCrc) ^ CRC_MAGIC_NUMBER : (usCrc + usCrc);
    }
  }

   return( usCrc );
}

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