Advanced colluder detection techniques for OSIFT-based hiding codes

— In this work, we examine a family of anti-collusion codes using the principle of “Orthogonal Spreading followed by the Inverse Fourier Transform (OSIFT)” as introduced in [1], [2]. The Hadamard-Walsh (HW) codes were adopted as the orthogonal spreading codes in [1], [2]. Here, we introduce another type of orthogonal spreading codes; namely, the carrier interferometry (CI) codes, which are comparable to HW codes. To detect OSIFT hiding codes against weighted collusion attacks, we propose advanced detectors that can identify a large number of colluders with weighted collusion attacks. The proposed detection schemes include the maximal ratio combining (MRC) scheme for colluder detection in the same group and the multiuser detection (MUD) scheme for colluder detection in different groups. It is demonstrated that HW- and CI-based OSIFT codes have robust performance with advanced detection schemes against weighted collusion attacks compared with conventional matched filter (MF) in an...

• Type: Conference
• Year: 2008
• Where: ISCAS
• Authors: Byung-Ho Cha, C. C. Jay Kuo
• Keywords: Hardware, ISCAS 2008, Orthogonal Spreading, Orthogonal Spreading Codes, Weighted Collusion Attacks