Attribute-based encryption implies identity-based encryption

In this study, the author formally proves that designing attribute-based encryption schemes cannot be easier than designing identity-based encryption schemes. In more detail, they show how an attribute-based encryption scheme which admits, at least, and policies can be combined with a collision-resistant hash function to obtain an identity-based encryption scheme. Even if this result may seem natural, not surprising at all, it has not been explicitly written anywhere, as far as they know. Furthermore, it may be an unknown result for some people: Odelu et al. in 2016 and 2017 have proposed both an attribute-based encryption scheme in the discrete logarithm setting, without bilinear pairings, and an attribute-based encryption scheme in the RSA setting, both admitting and policies. If these schemes were secure, then by using the implication proved in this study, one would obtain secure identity-based encryption schemes in both the RSA and the discrete logarithm settings, without bilinear pairings, which would be a breakthrough in the area. Unfortunately, the author presents here complete attacks of the two schemes proposed by Odelu et al.Postprint (updated version

Survey on Encryption Techniques in Delay and Disruption Tolerant Network

Delay and disruption tolerant network (DTN) is used for long area communication in computer network, where there is no direct connection between the sender and receiver and there was no internet facility. Delay tolerant network generally perform store and forward techniques as a result intermediate node can view the message, the possible solution is using encryption techniques to protect the message. Starting stages of DTN RSA, DES, 3DES encryption algorithms are used but now a day\u27s attribute based encryption (ABE) techniques are used. Attribute based encryption technique can be classified in to two, key policy attribute based encryption (KPABE) and cipher policy attribute based encryption (CPABE). In this paper we perform a categorized survey on different encryption techniques presents in delay tolerant networks. This categorized survey is very helpful for researchers to propose modified encryption techniques. Finally the paper compares the performance and effectiveness of different encryption algorithms

Simple Multi-Authority Attribute-Based Encryption for Short Messages

Central authority free multi-authority attribute based encryption scheme for short messages will be presented. Several multi-authority attribute based encryption schemes were recently proposed. We can divide these schemes into two groups, one of them are the ciphertext-policy attribute based encryption schemes (CP-ABE), the another one are the key-policy attribute based encryption schemes (KP-ABE). In our new multi-authority attribute based encryption scheme we combine them: the access structure will be given by authorities and the encryptor in conjunction. The authorities will be able to decide who is able to decrypt a ciphertext under their names, but the encryptor will choose the authorities whom he would involve in the encryption. In addition, our scheme is free of any central authority. The security of our new scheme relies on the decisional 3-party Diffie-Hellman assumption

A Survey on Secure Block Storage and Access Control Using Big Data Environment

Over past few years, the amount of data being collected continuous to grow more and more companies are building Big Data repositories to store , aggregate and extract meaning from this data and securing Big Data comes main challenge. This paper presents the comparison of different encryption based algorithms i.e. Key Management for Access Control , Attribute-Based Access Control, Attribute-Based Encryption (ABE), Key Policy Attribute-Based Encryption (KP-ABE), Cipher text -Policy Attribute-Based Encryption (CP-ABE) and cryptography for security and access control, its real time applications. This comparison results cannot provide flexibility and efficiency for data analysis. The future scope of this survey on big data can be discussed by using access control algorithm