How secure is The Cone of Silence?
The code is easy to crack but it protects against the most common threats such as casual viewers and automated scanners.
For example, a credit card thief may be using a tool like a search engine to scan email messages for key words like 'Visa', 'Mastercard', or 'American Express'. The Cone of Silence will foil such an attack.
Another example: Where I work, the automated email scanners won't let you use the word "naked", as well as many other common words, in an outgoing email. Using The Cone of Silence gets you past the automated scanner.
You could use ROT-13, and achieve about the same results, with a more common code, but that is even easier to decode.
MAX: Chief I think we need to use The Cone of Silence. CHIEF: Not The Cone of Silence Max.
MAX: It's the rules Chief.
CHIEF: Very well Max, The Cone of Silence...
-- from the TV show 'Get Smart'.
MAX: What did you say?