Computer speed isn't really an issue with one-time pads. The output is effectively random, if I recall properly (checks, yes I do), so there simply isn't the information there to break the code without the key, even in theory. You're not relying of the difficulty of computing anything.

At no point did I discuss the use of algorithmic random number generators: I may have neglected to specify, but's thats only because of the well-known idiocy of using one in connection with encryption.

I'm only discussing securing electronic communications: the rest of the trade craft is left as an exercise for the reader.

Given a one-time pad, using it to encrypt a message isn't the most difficult thing imaginable. It's the sort of thing you should be able to build to a very high level of assurance in a relatively short time. Be careful about what you write onto your transfer medium and you're pretty safe.