期刊名称：International Journal of Computer Science & Technology
印刷版ISSN：2229-4333
电子版ISSN：0976-8491
出版年度：2013
卷号：4
期号：4
页码：191-193
语种：English
出版社：Ayushmaan Technologies
摘要：In reality, it is impossible for attributes to be monitored by one authority. In MA-ABE, universal attributes set are divided into several domains and managed by corresponding authorities. A user will issue his attributes to all the authorities to get his decryption key. Decentralizing ABE is a special MA-ABE and it does not require a trusted central authority to conduct the system setup. In our system, any party can become an authority and there is no requirement for any global coordination other than the creation of an initial set of common reference parameters. A party can simply act as an ABE authority by creating a public key and issuing private keys to different users that reflect their attributes. A user can encrypt data in terms of any Boolean formula over attributes issued from any chosen set of authorities. Finally, our system does not require any central authority. In constructing our system, our largest technical hurdle is to make it collusion resistant. Prior Attribute-Based Encryption systems achieved collusion resistance when the ABE system authority”tied” together different components (representing different attributes) of a user’s private key by randomizing the key. However, in our system each component will come from a potentially different authority, where we assume no coordination between such authorities. We create new techniques to tie key components together and prevent collusion attacks between users with different global identifiers.
关键词：Access Structure;Attribute Based Encryption;Constant Cipher Text Size;Decentralizing
