This ingenious method is impossible for police to crack. It works like this:
Both persons (or multiple parties) purchase the exact publication of any random dictionary. The messenger writes the page number of the word needing to be communicated followed by a dash (hyphen) followed by the number the word appears in the list on the page of the dictionary. For instance, if the word needing to be communicated is "stash," the code for this word could be 210-14 because "stash" appears on page 210 and is the fourteenth word listed. A dictionary makes it easier to locate the words but you may use a novel or any other book.
To further protect the message, open a Hushmail email account (it's free) and share the username and password with your partner. Do not email the coded message back and forth. Simply type the code into an email and save it to DRAFT. The receiving party of the message can login to the account and check the DRAFT folder for the message and reply using the same method. This combination of code writing and saving to DRAFT is impossible to de-code.