Digital Watermarking and Encryption: A Review

Abstract

Digital Watermarking also referred to as simply watermark is a pattern of bits inserted into a digital image, audio, video or text file that identifies the file's copyright information (author, rights, etc.). The name comes from the faintly visible watermarks imprinted on stationary that identify the manufacturer of the stationery. The purpose of digital watermarks is to provide copyright protection for intellectual property that's in digital format. Digital watermarking can be characterized on the basis of several properties which depend on the type of application. These properties include robustness, capacity, imperceptibility, security and other restrictions. The art of securing information by scrambling it into unrecognizable format called cipher text. A secret key is used for encryption and decryption process. Cryptography only hides the content of message not the existence of message. In this paper we provide a review on various digital watermarking & encryption techniques.