In this paper, we define and explore proofs of retrievability (PORs). A POR scheme enables an archive or back-up service (prover) to produce a concise proof that a user (verifier) can retrieve a target file F, that is, that the archive retains and reliably transmits file data sufficient for the user to recover F in its entirety.A POR may be viewed as a kind of cryptographic proof of knowledge (POK), but one specially designed to handle a large file (or bitstring) F. We explore POR protocols here in which the communication costs, number of memory accesses for the prover, and storage requirements of the user (verifier) are small parameters essentially independent of the length of F. In addition to proposing new, practical POR constructions, we explore implementation considerations and optimizations that bear on previously explored, related schemes.In a POR, unlike a POK, neither the prover nor the verifier need actually have knowledge of F. PORs give rise to a new and unusual security definition whose formulation is another contribution of our work.We view PORs as an important tool for semi-trusted online archives. Existing cryptographic techniques help users ensure the privacy and integrity of files they retrieve. It is also natural, however, for users to want to verify that archives do not delete or modify files prior to retrieval. The goal of a POR is to accomplish these checks without users having to download the files themselves. A POR can also provide quality-of-service guarantees, i.e., show that a file is retrievable within a certain time bound.

PORs: Proofs of Retrievability for Large Files

A survey of cloud computing data integrity schemes

Data dynamics for remote data possession checking in cloud storage

The conventional Hill cipher provides less information security due to fixed N N  key matrix dimensions. In this paper, a new modified Hill cipher is introduced which provides enhanced security performance than the conventional hill cipher scheme. This enhanced security of the modified Hill cipher is dependent on the non-square N M  matrix approach. The N M  Hill cipher matrix defuses N plaintext information letters into M cipher text messages. Therefore, the varying M redundant cipher text bestowed more confusion than the conventional Hill cipher. Moreover, the modified technique provides always non-singular matrix while finding its inverse which makes free from the complication of singular matrixes in the conventional Hill cipher scheme.

/pdf/security-enhancement-of-hill-cipher-by-using-non-square-3rikbsrj9d.pdf

Security enhancement of hill cipher by using non-square matrix approach

Generation of high-order random key matrix for Hill Cipher encryption using the modular multiplicative inverse of triangular matrices

Cloud storage enables users to access their data at any time anywhere. It has the advantages of high scalability, ease of use, cost effectiveness, and so on. However, the server that stores users' data may not be fully trustworthy. When users store their data in cloud storage, they concern much about data intactness. This is the goal of remote data possession checking schemes. This paper proposes a Hill cipher-based remote data possession checking scheme. The main idea of the scheme comes from the homomorphism of Hill cipher, namely the tags computed from plaintext blocks can be used to compare with the tags computed from ciphertext blocks. It has several advantages as follows. First, it is efficient in terms of computation and communication. Second, it allows verification without the need for the challenger to compare against the original data. Third, the scheme only needs to store a small amount of metadata and use only small challenges and responses. Finally, it performs data possession checking at the same time it provides confidentiality of data. The security and performance analysis illustrates that the scheme is feasible and effective. Copyright © 2013 John Wiley & Sons, Ltd.

A hill cipher-based remote data possession checking in cloud storage

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A hill cipher-based remote data possession checking in cloud storage