I'm looking for specific names and literature on crypto algorithms that accept every passphrase input by the user, in order to 'decrypt' - even with false passphrase - and present the unlegit user with a false plaintext. The unlegit user should not be able to determine whether the 'decrypted' text is real or fake - as it accepts every passphrase.
Of course using the legit passphrase reveals the legit plaintext.
I found two examples of what I mean: The Fraunhofer Institut in Germany invented a smartphone password-manager app that uses this kind of technology. Its called iMobileSitter. And I think on Eurocrypt2014 a paper called 'Honey Encryption' with a similar algorithm has been submitted.