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Two words: "document it".
Do not approach him/her verbally, send him/her an email with your idea/work and that is a solid proof that it is coming from you and not from anyone else ;)
Yes, I have done that many times and it always worked :D
Never show all your cards. if your boss is habitual of getting credit over your assignments, then keep one or more factors yet to be explanined. when he would be called for explanation he will try to contact you this will make the top management reveal regarding the initiator
It may work but it may offend your manager