Revocable-Storage Identity-Based Encryption: Secure Data Sharing In Cloud

Abstract

Cloud computing provides a simplest way of data sharing, it provides various benefits to the users. But directly outsourcing the shared data to the cloud server will bring security issues as the data may contain valuable information. Hence, it is necessary to place cryptographically enhanced access control on the shared data, named Identity-based encryption to build a practical data sharing system. when some user's authorization is expired, there should be a mechanism that can remove him/her from the system. Consequently, the revoked user cannot access both the previously and subsequently shared data. Thus, we propose a notion called revocable-storage identity-based encryption (RS-IBE), which introducing the functionalities of user revocation and cipher text update simultaneously.Keywords: Revocation, Encryption, Key Exchange, Private key generator, cipher text. 1.INTRODUCTIONCloud computing is a model for enabling convenient, on demand network access to a shared pool of computing resources (eg. Networks,servers,storage and services).In the earliest stage of cloud computing security is provided by Certificate Based Encryption which encrypt the data based on certificate which is provided to the data user. Unauthorized user may duplicate the certificate which may lead to security issue. To overcome the issue, Identity Based Encryption replaces this technique. In which the user's id (name, email address, ip address, port number, etc.) is used to generate the keys which are used to encrypt the data. This does not provide security to data shared in cloud because the data is stored for a longer period by then the data is accessible to the third party very easily. To avoid this Identity Based Encryption With Efficient Revocation was introduced. In this approach the data provider can provide the life time of the key provided to the user. At the end of the life time the user can revoke the key with the help of central authority called Private Key Generator (PKG). After this Revocable Storage Identity Based Encryption is proposed, this provides both forward and backward security which is absent in previous technique. This technique allows the data provider to specify the life time of the data shared as well as the private key provided to the data user. Once this time expires the private key generator (pkg) is responsible for revoking the cipher text and private key of each user. This mechanism of providing security in both the ends is called as forward and backward security. LITERATURE SURVEY: 2.1CERTIFICATE-BASED ENCRYPTION:A certificate, namely a signature acts not only as a certificate but also as a decryption key. A key holder needs both its secret key and an up-to-date certificate from its CA to decrypt a message. Certificate-based encryption combines the best aspects of identitybased encryption and public key encryption. Certificate include at least the name of a user and its public key. Often, the certificate authority includes a serial number as well as the certificate issue date and expiration date. if ...

Rsa Encryption Using Vlsi Architecture for High Speed Applications

“…Also, it discusses the resource sharing issues between the encryption and decryption of AES algorithm. The revocable identity based encryption in cloud to secure the data is discussed in [15].…”