Privacy-Secure Digital Watermarking for Fair Content Trading
Mitsuo Okada · Applied Cryptography and Network Security · 2012
This chapter describes a privacy-secure digital watermarking scheme for fair content trading against cybercrime on digital content piracy and privacy leakage.Conventional digital watermarking schemes are effective only for providers since privacy of a client is not concerned though content is protected.Provider's security as well as client's security need to be considered to enhance security level of privacy management.Blind and Pseudo-blind watermarking schemes utilizing encryption and media processing respectively are the solutions to protect client's security.In conventional digital watermarking, embedding and extracting are carried out by the same providers.Therefore, a malicious provider could provide fake extracted results to a client.Verification result is considered as trustworthy evidence under the assumption that a provider is trustworthy since most of the providers were owned by enterprises which has relatively high social credibility.However, anyone is able to become a provider these days along with development of technologies.Therefore, improper providers which have insufficient level of knowledge or skill would manage client's privacy information.In other words, a user has to own his/her risk on the privacy information.