Confidential Information Poisoning Methods by Considering the Information Length in Electronic Portable Devices

To prevent leakage of personal information and privacy, there is an AR technology in which secret information from handy device is overlaid on paper on which nothing about personal information is printed. The invention takes bothers away from people who have to care about printed papers when they dump them. However, to be overlaid, the secret information drawn from handy device such as smart phone must be kept in the phone or be taken from a server via the phone. Ultimately the phone has to be locked by password to prevent secret information from being leaked when the phone is lost. If the length of the password is short, the password may be broken easily by attackers, and if the length is long enough in terms of security, inputting of the password always bothers the owner of the phone. Therefore, we suggest a poisoning method that prevents attackers from finding correct information although 4 digits password is applied for locking the phone. In the method, dummy words cannot be winnowed out and they fit in the space for correct one.