公开(公告)号：MY179060A

公开(公告)日：2020-10-26

申请号：MYPI2012004831

申请日：2012-11-05

Applicant: MIMOS BERHAD

Inventor： MOHAMED RIDZA WAHIDDIN ,  CHIEN SU FONG ,  JAMALUL-LAIL AB MANAN ,  FAISAL ALY ALY EL-ORINY

Abstract: The invention provides a method (100) of multi-user steganography. Firstly, the method involves establishing secure channels between at least three users including the steps of: each of the users randomly selecting a sequence of ordered GreenbergerHome-Zeilinger (GHZ) states having at least three particles (110); each of the users taking one particle from each of their respective GHZ states to each form at least three subsequences (120); each of the users keeping an initial subsequence in their own site and transmitting a respective one of the remaining subsequences to each of the other users (130); and each of the users checking the security of established channels by measuring the number of particles on either side, as agreed between the users (140). Next, the method involves the users transmitting messages between each other by performing the steps of: each of the users encoding a cover message by applying a unitary transformation on the subsequences sent by the other users (150); each of th users transmitting the subsequences encoded with their cover message to the other users (160); each of the users retrieving their respective subsequence in which the cover messages of the other users are encoded (170); each of the users performing GHZsbased measurements on the subsequence having the cover messages of the other users encoded thereon, and comparing measurement outputs with the initial subsequence to obtain the encoded messages (180); and each of the users checking the security of established channels by measuring the number of particles on either side, as agreed between the users (190). After this process. the users exchange stenographic messages (200).