The wide spread of the Internet increases the availability of all digital data such as image, audio and video to the publics. Digital watermarking is introduced to provide the security, data authentication and copyright to the digital data. This paper provides the basics of watermarking techniques, various applications; attacks carried in watermarking and detail study of reversible watermarking technique. One of the important techniques in watermarking is a reversible watermarking [52] technique. Reversible watermarking strengthens the ownership of the digital data and also supports to recover the original data from the watermarked digital data.

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VANET is an emerging technology to achieve intelligent intervehicle transmission and result if VANET. It Mostly resembles criteria remain same. The speed and choice of the path describe the dynamic topology [2] of VANET. If we assume two vehicles moving away from each other with a speed of 60 mph. Some of the well known ad hoc routing protocol such as AODV (Ad Hoc on demand distance vector) and DSR (Dynamic source routing) are therefore can be applied to VANET as well. VANET provides a wide range of applications like safety of vehicles on roads, driver assistance, sharing traffic and determining road conditions for smooth flow of traffic. In this paper various systems using collision avoidance [8] and provides the road safety using ITS (Intersection collision avoidance), CWAS (collision warning avoidance system), and the most appropriate simulation tools to simulate VANET protocol and applications). VANET has the tremendous challenges in roadside areas because VANET having the potential to avoid the traffic accidents and having efficiency. Recent research have been placed the VANET design architectures and implementations. Nowadays VANET research work have been focuses on the including areas like routing, broadcasting, Quality of Service (QoS), and security. We survey some of the research results in these areas.

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