How to break the save system?

If the game can save and load files using scripts, then after the user clicks "End Turn," the game's identifier can be saved to a file... when the game starts, a session identifier is generated (a random number within a certain range, repeated four times, like a PIN code, although more variables could be used, but four is optimal), and a file with this identifier is saved – we have now recorded the session identifier, and the session control variable receives this value... before the user clicks "End Turn" again, the file is read, and a verification generation of the identifier, similar to a PIN code, is performed, meaning it's generated in four digits – a match is practically impossible!

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r = os.clock() function _random()   math.randomseed(r);   r = math.random()   return r; end