Ian Flemming did write Casion Royale. However, most of the Bond movies, are based very loosely on the original book, and few, have absolutely nothing much to do with the book other than the name. Goldfinger is probably one of those that are closest to the original book.
That said, Ian Fleming wrote only 12 novels and 2 collections of short stories.
Btw, Casino Royale was infact the first of all Bond novel.
OIC, so i guess the quote 'base on novel by Ian Flemming' is quite valid in this 007 movie..i know that some james bond movie aren't based on the story..like the 4 movies by Pierce Brosnan..
Thanks for the information.