I think that not what the Da Vinci code indicates but who the Teacher is keeps readers in suspence. Actually, most of codes professor Langdon decoded in the story was made by the curator Sauniere, not by Da Vinci himself.
This book was translated into Japanese. I wonder how the translator put the ciphers in Japanese. In my opinion, the ways of decoding them depend on the features of language. So I'm interested in how to put ciphers into another language.
Before wrapping up this entry, I'll quote a part of remark:
Everyone loves a conspiracy.(p500)