ABSTRACT
This chapter discusses symmetric fingerprinting as well as fingerprinting in a broadcast channel environment, which involves sending one encrypted copy of the multimedia to several end users, where symmetric fingerprinting at decryption takes place. The problem of digital fingerprinting consists of many components that can be formulated separately. In fingerprinting a given dataset, all legal copies of the digital data are “similar,” with the exception of the unique imperceptible fingerprints; that is, all copies of the digital data appear to be visually or audibly indifferent. In symmetric fingerprinting, the buyer has no protection against a dishonest merchant whose intent is to frame the innocent buyer. The chapter presents some criteria and design methods for achieving a solution for fingerprinting in a broadcast channel environment. It concludes with some novel insights into the use of chameleonlike ciphers for bandwidth-efficient, combined media decryption and fingerprinting.
