save and load system -help?

save and load system -help?

hi,

im planning to make a game with a save and load system with a code like in defi4nc3s orpg, dark lineage oven, night of the dead, legacies: tides of the serpent ...etc.

however isnt it so that everyone who has the code can use it?
so if i gave my code to a friend, he could just use my character?

thats actually the thing i want to prevent in my map and im looking for a code system that somehow binds the nickname of the player into the code, so just the person who made the character can use it
does anyone know where i can find such a code system?

there is something like that implemented in the map Survival RPG
i'm not sure whether it works or not but i would imagine it does something with converting the string for the player's name into an integer of some sort. you can do that in wc3, right?