POCS Based Digital Watermarking in Buyer-Seller Watermarking Protocal

Buyer-Seller 워터마킹 프로토콜 상에서 POCS 기반의 디지털 워터마킹

  • 권성근 (삼성전자 무선사업부) ;
  • 이지혜 (부산외국어대학교 전자컴퓨터공학과) ;
  • 이석환 (동명대학교 정보보호학과) ;
  • 권기룡 (부경대학교 전자컴퓨터정보통신공학부)
  • Published : 2007.05.30


Digital watermarking technique for copyright protection and prevention of illegal copy and distribution can provide the reliable transaction to both buyer and seller in e-commerce through the cryptographic protocol such as 'Buyer-seller watermarking protocol'. Recently there has been researched about some cryptographic protocols for watermarking system but there has no yet mentioned about the implementation of practical watermarking technique in protocol. This paper presents the watermark embedding technique based on POCS in buyer-seller watermarking protocol. The proposed method designs the robust convex set based on EZW and the invisible convex set using PSNR and then projects into two sets until the convergence condition is satisfied. Experimental results verified that BER of watermark that is embedded by the proposed method has lower 0.02-0.10 than BER of the conventional method.