Open Access Open Access  Restricted Access Subscription or Fee Access

Minimization of Cipher Text Size and KAC for Data Sharing in Cloud

K. Karthika, M. Beula


Cloud computing are the delivery of hosted services over the internet. Due to various data leakages the data owner encrypts the files before uploading to the cloud storage. Data user need to decrypt the files so request has been sent to data owner. The data owner sends the single aggregate decryption key for the data user. The aggregate decryption key helps to decrypt the files. This compact single key can be conveniently sent to data users so that multiple key costs can be saved. The problem here is the size of cipher text stored in cloud is large. The number of cipher text grows rapidly in cloud system. So we have to save space for future extension. In the proposed system, the size of cipher text is minimized using UTF-8 bit character encoding. It helps to reduce the large size of cipher text stored in cloud space.


Key Aggregate Cryptosystem, UTF-8 bit Character Encoding

Full Text:



Cheng-Kang Chu, Sherman S.M.Chow,Wen-Guey Tzeng, Jianying Zhou,and Robert H. Deng, “Key aggregate cryptosystem for scalable data sharing in cloud storage,” Senior Member, IEEE,2014.

V.Goyal, O.Pandey, A.Sahai, and B.Waters,"Attribute-Based Encryption for Fine-Grained access Control of Encrypted data," in Proceedings of the 13th ACM Conference on computer and communications security ACM,2009.

D.Naor, M.Naor, and J.Lotspiech,"Revocation and Tracing Schemes for Stateless Receivers," in Proceedings of advances in cryptology, 2008.

Y.Sun and K.J.R. Liu,"Scalable Hierarchical Access Control in Secure Group Communications,"in proceedings of the 23th IEEE International Conference on Computer Communications.IEEE,2007

C.Wang,S.S.M.Chow,Q.Wang,K.Ren,and W.Lou,"Privacy-Preserving Public Auditing for secure cloud storage,"IEEE Trans Computers,vol.62,n0.2,pp.362-375,2013


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.