To neutralise this invasion of privacy, we need someone to write an encryption program that will place two or more different files (or messages) in a single encrypted document - with two different passwords. Enter one password, the first file comes out; Enter the other password, the second file is returned. But at no time should the decryption program reveal just how many files are encrypted.

To preserve plausible deniability, if one only stores one file in the encrypted file then the program should encrypt random characters of a similar length to the file with a very long, random password. (or some similar means of obfuscation).