Multi Party Key Authentication and Steganography for Secured Data Transaction in Cloud

Cloud computing is appearing data interactive paradigm to realize users’ data remotely stored in an online cloud server. Cloud services provide great conveniences for the users to enjoy the on-demand cloud applications without considering the local infrastructure limitations. During the data accessing, different users may be in a collaborative relationship, and thus data sharing becomes significant to achieve productive benefits. The existing security solutions mainly focus on the authentication cannot be illegally accessed, but abandon a subtle privacy issue during a user challenging the cloud server to request other users for data sharing. In this proposed system contain a three Entities Users, Cloud Server & Trusted Third Party (TPA). Data Users are both Data Owners & Data Users. Every User will be registering with the Cloud Server. Cloud will be generating Pair wise Keys, Primary & Secondary Keys for both Cloud Server & Data User. Users one wants to Access the data of other Users then Keys are Shared Keys are generated and accordingly the Data is authorized for Usage. In an Access key is generated while Registration with Cloud. After that only Shared Keys are generated. Finally a Mutual Access key is generated by the data owner to the data user and sent via Email. Data User will have to hide that Mutual Key in an Image called Steganography and sent to the Data Owner. Data is accessed by only after Verifying Mutual Key using Destaganography. The process requires high security and data integrity and also used to easily find the attacker.