Secret Sharing Scheme Based on Cauchy Matrix for Data Outsourcing

Secret Sharing schemes have been used for privacy preserving data outsourcing because of the slight advantages in security and speed over encryption based schemes. Data outsourcing using secret share based scheme also result in greater fault-tolerance and data availability at the time of failures. In this paper a secret sharing scheme based on Cauchy matrix is proposed, which can be used for secure data outsourcing. The proposed scheme is compared with Shamir's scheme which is widely used for data outsourcing and it has been found that the latter performs better in share generation phase whereas the former performs better in secret reconstruction phase.