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A multimedia system is a system which is used to process the multimedia data and theapplications of it. The multimedia database usually comprises of the data in the form of text,images, audio and graphic objects. A video consists of moving images with the presence of audioi.e. sound in it because of which the information can be conveyed effectively through it. Thus thedigital videos have formed a very important place in most of the digital information systems. Thetwo fundamental considerations in the transmission of a digital video are security andauthentication of the data. Hence, use of cryptography and steganography or watermarkingtechniques for transmission of digital videos in multimedia systems play an important role. Thispaper presents a comprehensive study of cryptography and data hiding techniques i.e. bothsteganography and watermarking techniques in digital videos to develop a smart and securemultimedia based application. The purpose of cryptography is to hide the content of the messagewhile the steganography aims to hide the existence of the message itself to prevent itsunauthorized access, hence also known as covered writing. The watermarking techniques also dothe same thing but the objective of using them is to maintain the unique identity of owner andauthenticate the file. Thus if we use both cryptographic schemes and the tools or methods forhiding the existence of data, then it will enhance the level of security in terms of prevention ofillegal/fraud access, protection of right of the ownership of the file. Therefore, both the aspectsshould be simultaneously taken into consideration so far the development of security systems fordigital videos is concerned is suggested in the paper.
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7/21/2019 A Comprehensive Study of Cryptography & Content Hiding Techniques for Security of Digital Videos
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