A novel block inverse Jacket transform is proposed. A cocyclic block inverse Jacket matrix is constructed in which the high-order cocyclic block inverse Jacket matrix can be decomposed into the low-order sparse cocyclic block inverse Jacket matrices with a successive block architecture , instead of the conventional block inverse Jacket matrix(BIJM). It is a fast algorithm by using recursive mode that leads to reducing computational load.

/pdf/a-kind-of-block-inverse-jacket-transform-52lucldy0r.pdf

A Kind of Block Inverse Jacket Transform

The Wireless body area network (WBAN) is a network composed of sensors communicating through wireless technology, these sensors can capture and encrypt the physiological data of the human body and transmit it to a remote cloud server for use by authorized users. However, how to retrieve and obtain the encrypted data has become a problem that must be solved. Nowadays, searchable encryption with keywords (SEK) is a widely used technology to solve this problem. Nevertheless, there are some problems that need to be noted. First, SEK is vulnerable to keyword guessing attack (KGA) and inside keyword guessing attack (IKGA). Second, since the sender and receiver are likely to work under different cryptosystems, the designed scheme should satisfy heterogeneity. Third, the communication parties in heterogeneous domain usually use different cryptographic system parameters, achieving cross-domain authentication between these communication parties can greatly improve the practicability of the scheme. To address these issues, we put forward a new searchable signcryption scheme for WBAN. Under the complexity of computational assumptions, the proposed scheme is proved to simultaneously achieve ciphertext indistinguishability, trapdoor indistinguishability, ciphertext unforgeability and the resistance of KGA and IKGA in the random oracle model (ROM). Further, our scheme allows the WBAN sensors in the certificateless public key cryptography (CLC) environment and the receivers in the public key infrastructure (PKI) environment to realize cross-domain authentication and heterogeneous communication. Compared to the five existing schemes, the total computation cost of our scheme is reduced by at least 59.99%. 

https://www.researchsquare.com/article/rs-1647848/latest.pdf

Cross-domain heterogeneous signcryption with keyword search for wireless body area network

Searchable encryption (SE) technology allows users to use keywords to retrieve encrypted data and ensure that useful plaintext information about encrypted data will not be disclosed. For a secure SE scheme, if it is able to meet the multi-trapdoor privacy (MTP), the security will be improved compared with the traditional SE scheme. However, there are few searchable encryption schemes that can meet the requirements of MTP. In addition to the security of the SE scheme, we should also strive to improve its practicability. Nowadays, many existing SE schemes use a single keyword to generate the keyword ciphertext and trapdoor for retrieving ciphertext, which will greatly reduce the accuracy of the search result. Another phenomenon deserves our attention. In recent years, public key cryptosystems such as certificateless cryptography (CLC) and public key infrastructure (PKI) have been widely used. If a SE scheme satisfies heterogeneity means that both sides of communication parties do not need to restrict the use of the same cryptosystems, the practicability of this scheme will be improved. Therefore, we propose a heterogeneous SE scheme that provides MTP. The new scheme supports multi-keyword search and allows the sender and receiver to be worked in different cryptosystems. Furthermore, it would obviously be impractical to use the same cryptographic system parameters between heterogeneous systems, so the communication parties in our scheme operate in different cryptosystems with different cryptographic system parameters. With the use of the random oracle model (ROM), we demonstrate the security of the proposed scheme, and we show the excellent performance of the proposed scheme at the end of the article. 

/pdf/an-enhanced-heterogeneous-public-key-searchable-encryption-1pyqq1z6.pdf

Da Zu Huang

Papers

A Kind of Block Inverse Jacket Transform

Cross-domain heterogeneous signcryption with keyword search for wireless body area network

An enhanced heterogeneous public key searchable encryption scheme supporting multiple keywords