The Dynamic Proof of Storage is a very useful cryptographic scheme which enables a user to update the file or check for the integrity of the data in a cloud server. There exists dynamic schemes in the single user environment but for the multiuser environment, the algorithm is still not been analysed yet. For a multi user cloud storage system, a secure multi user deduplication technique is needed which would enable the user to skip the file upload and gain the instant automated ownership when the other owner of the file have uploaded the file on the server. This paper introduces the concept of deduplicatable dynamic proof of storage and also propose an efficient construction in order to achieve a dynamic and secure cross user deduplication simultaneously.
