A Confused Document Encrypting Scheme and Its Implementation

Abstract

In this paper, we propose a new document protecting scheme, called Confused Document Encrypting Scheme (CDES). The method used by the present scheme is a completely new one for document protections. The main spirit of the secure system is that we do not need send encrypted plaintext directly to message receiver, however, we send a meaningful cheating text and an encrypted special index file to message receiver. The most significant characteristic of this method is that it owns cheating function, and no hackers can exactly know the cheating text he gets is real or false message. Besides, the cryptosystem uses probabilistic idea and IDEA to encrypt the special index file. And we have developed a software package to implement the proposed encrypting and decrypting algorithms.