In the Teaching Guide, in the Getting Started section, it states:
Prompt: Let’s do a thought experiment: [...snip...] Can you figure out a way for Bob to send Alice an encrypted message that only Alice can read?
Have small groups or pairs discuss this problem for a few minutes and then ask if there are any solutions.
Teacher’s Note: There is no way to do this. [...snip...]
One of my students came up with the answer of "One-time Pad" and I couldn't come up with a reasonable argument why his answer isn't valid. Can someone elaborate as to whether or not a one-time pad is a valid answer to the posed question? Thanks..