The One-Time Pad Debate is both dumb and unsolvable, because people aren't actually arguing about one-time pads, they are arguing over whether it's better to be a Huge Nerd or a Cool Jock.
Huge Nerds value accurate portrayals of science and techniques, and they like getting deep in the guts of how things work. More than this, they love "gotchas"; neat corner-case interactions that go against the grain of typical clichés and are obtained through clever understanding of mechanisms. Huge Nerds are the kind of people who have a mortal manage to escape a pack of werewolves because actually, fur hinders perspiration and diminishes the werewolves' physical endurance. And they are, indeed, the kind of people who understand, and more than that appreciate, the process by which a one-time pad is meaningfully different from other encryption, and to them it feels rewarding that this difference have consequences in the game. It showcases an understanding of science, it creates neat "gotcha" cases, and it celebrates human ingenuity: here is an example, drawn from the real world, of something a mortal could make that defeats the flawless magic of the Exalted.
Cool Jocks don't give a shit. They are here to tell a story alongside rules that define badass magic that does things. Encryption is encryption. You talk to them about how an OTP works and they yawn and stop paying attention, or they just stare blankly waiting for you to get to the point. An OTP works in such and such way, and so... what? It's encryption. Narratively, what encryption does is tag things with a "this is encrypted" label, that tells you that you need to decipher it, and the exact nature of the encryption is like, who cares? It's not that encryption is lame (it absolutely is, but that's unrelated), it's that the purpose of various encryption techniques is to provide stunt fodder and, at most, set the Difficulty rating of the decryption roll. Generously, an OTP might have a decryption difficulty of "impossible without magic" because it's impossible to decipher in the real world, but, well, magic is magic, and encryption is encryption. Once you bring in the decryption Charm, the OTP gets decrypted, because Cool Jocks don't give a shit about the finer details of how OTPs work. They care that the narrative purpose of encryption is to hide things, and the narrative purpose of decryption Charms is to find things out, and that's it. The idea that one kind of encryption works in a weird specific way that could theoretically make decryption inapplicable is... Boring, and weird. It's encryption, decryption Charms beat it, why are we talking about this? Why are you nerding out on me? I refuse to sit there and listen to ten minutes of lecturing about how some mundane thing that exists could defeat magic because of scientific details I don't give a shit about. I am running a game, you huge nerd.
And this is why this discussion will never be settled no matter how many times we have it, because it's not about the mechanics of one-time pads and specific Charms, it's about people's core assumption about how the game should work.
and I would rather make the entire Inner Sea smaller just to accomodate Triremes to spite this entire thread. Owned, nerds. 
