unique id for each player

Any ideas where start wit this? my game must send info to website. My friend is webmaster so i must do all things from C2 side We can use JSON to send informations he said

For a new player, if a unique ID webstorage key doesn't exist, use ajax to post to the server and return the new key, then save it as the unique ID webstorage key.

If not a new player just post to the server with the saved webstorage key.

This doesn't sound very secure to me, so hopefully someone can chime in with a way to lock this down.

thehen thanks for your interests, Prabably game will be hve new and old users. Your tips might be included to one event sheet with game events?

And my pal give me two php files 'test request' and 'test response' what i should do with this ?

bump