Improving Security and Sharing Management in Cloud Computing Using TPA

Cloud computing as a model is capable of providing suitable, ubiquitous and on-demand network access to a mutual pool of configurable computing resources that is able to rapidly provision and release with less effort of management from the side of the user and less interaction of service provider. The aim of this paper is to design and implement a system based on Third Party Auditor (TPA) which is a reliable party works as a key center to generate and distribute the keys between the users in the system, also, it can manage the keys, create secret keys of different lengths and provide a range of services including confidentiality, security, and identity verification Authorized users. Additionally, it encrypts and decrypts and shares data between users and protects the data sent between customers with a high degree of security through the using three types of public, private and symmetric keys using the digital signature. The digital signature is different from user to user for each file uploaded or Modifying or updating it by the user (owner, client) or TPA in the system. Therefore, the chaotic map algorithm is used to enhance the system strength used in TPA for generating different keys.