In Inception, many of the main characters reveal what their totems are (not necessarily how they work) to their associates. For example, Ariadne is shown to have a weighted bishop and Arthur is shown to have a loaded die. While only they know exactly how their respective tokens function, the fact that they reveal what their tokens are to each other seems counter-intuitive - especially since if they are kidnapped or sedated (like what they did to Fischer) and betrayed by each other, then their captors could easily find out how the totem works in the real world, and then assumedly use that knowledge when creating the dream world to make the captive think that it is real, when in fact it is not.
Example demonstrating the above argument:
Arthur is kidnapped and sedated by Eames. Eames knows about Arthur's loaded die and so he can easily find it on his person IN REAL LIFE, and find out which number it lands on. He then gets an architect to make the die land on the same number in his dream. And then can lead Arthur into his dream and make it appear like real life for Arthur.
While the argument could be made that they share what their tokens are only to people they trust, why would they not also share how their totems function if they actually trusted each other?
Is it not much more prudent to hide exactly what their token is, even to their friends, similarly to what Eames does (or should I say doesn't) do? Specifically, he never states what his totem is, and it is only suggested that his totem is the poker chip.