scholarly journals A Collusion-Resistant Identity-Based Proxy Reencryption Scheme with Ciphertext Evolution for Secure Cloud Sharing

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Shimao Yao ◽  
Ravi Sankar ◽  
In-Ho Ra
Keyword(s):  
Data Security ◽  
Computing Time ◽  
Public Key Infrastructure ◽  
Public Key ◽  
The Public ◽  
User Data ◽  
Identity Based ◽  
Certificate Management ◽  
Simulation Results ◽  
Authorization Delegation

In order to solve the challenges of user data security in the cloud computing (storage) environment, many encryption solutions with different features have been presented. Among them, proxy reencryption (PRE) based on public-key infrastructure (PKI) is a promising technology for secure cloud sharing. And identity-based proxy reencryption (IBPRE), which uses identity as the public key, eliminates burdensome certificate management and is, therefore, more preferable. However, most of the current IBPRE schemes only focus on the processing of data sharing while overlooking the functions of authorization revocation and ciphertext update, which are more closely related to the security of data itself. Moreover, the few existing schemes that involve ciphertext update turn out to be impractical because the length of ciphertext increases with the reencryption of ciphertext. In this paper, an improved IBPRE scheme, which provides improvements on the inadequacies of the scheme proposed by Ateniese et al. especially in terms of collusion safety and ciphertext evolution, is proposed. To the best of our knowledge, this is a practical IBPRE scheme integrating the functions of access authorization, delegation revocation, ciphertext update, reauthorization, and conditional reservation delegation. The proposed technique has high practicability in the scenario where a large number of ciphertexts need to be updated synchronously. Lastly, the comparative analysis and simulation results show that the two reencryption algorithms in the proposed scheme have the shortest computing time than other schemes.

scholarly journals S3DCE: Secure Storing and Sharing of Data in Cloud Environment using user Phrase

2020 ◽  
Vol 9 (4) ◽  
pp. 1191-1198
Keyword(s):  
Resource Utilization ◽  
Data Security ◽  
Communication Channel ◽  
Third Party ◽  
Public Key ◽  
Time Cost ◽  
Cloud Environment ◽  
The Public ◽  
User Data ◽  
Distributed Cloud

Distributed Cloud Environment (DCE) focuses mainly on securing the data and safely shares it to the user. Data leakage may occur by the channel compromising or with the key managers. It is necessary to safeguard the communication channel between the entities before sharing the data. In this process of sharing, what if the key managers compromises with intruders and reveal the information of the user’s key that is used for encryption. The process of securing the key by using the user’s phrase is the key concept used in the proposed system “Secure Storing and Sharing of Data in Cloud Environment using User Phrase (S3DCE). It does not rely on any key managers to generate the key instead; the user himself generates the key. In order to provide double security, the public key derived from the user’s phrase also encrypts the encryption key. S3DCE guarantees privacy, confidentiality and integrity of the user data while storing and sharing. The proposed method S3DCE is more efficient in terms of time, cost and resource utilization compared to the existing algorithm DaSCE (Data Security for Cloud Environment with Semi Trusted Third Party) [22] and DACESM (Data Security for Cloud Environment with Scheduled Key Managers) [23].

scholarly journals A Certificate-Based Provable Data Possession Scheme in the Standard Model

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Caixue Zhou
Keyword(s):  
Standard Model ◽  
High Efficiency ◽  
Public Key Infrastructure ◽  
Public Key ◽  
Provable Data Possession ◽  
The Public ◽  
The Standard Model ◽  
Identity Based ◽  
The Cost ◽  
Very High

Certificate-based cryptosystem can not only resolve the private key escrow problem inherent in the identity-based cryptosystem but also reduce the cost of public key certificate management in the public key infrastructure-(PKI-) based cryptosystem. Provable data possession (PDP) can ensure the integrity of users’ data stored in the cloud at a very high probability. By combining these two concepts, we propose a certificate-based PDP scheme. We prove that our scheme is secure in the standard model assuming that the Squ-CDH problem is hard. Based on the index logic table, our scheme can be extended to support dynamic operations easily. Efficiency analysis shows that our scheme has high efficiency.

scholarly journals Revocable IBE combined with CRA to overcome the inadaptability problem

2019 ◽  
Vol 9 (1S) ◽  
pp. 71-77
Keyword(s):  
Public Key Infrastructure ◽  
Public Key ◽  
The Public ◽  
Identity Based Encryption ◽  
Cryptographic System ◽  
Identity Based ◽  
Key Update

Identity based encryption (IBE) is an open key cryptographic system and takes out the requesting of the Public key infrastructure(PKI) and confirmation relationship by and large key settings. Due to the nonappearance in PKI, the cancelation problem has become a primary issue in the IBE settings. Two or three cancellable IBE plans have been already proposed concerning this point. As of late, by embeddings an outsourcing figuring framework into the IBE, Li et al. presented a cancellable IBE scheme with the feature of key-update cloud authority association (KU-CSP). Regardless, their arrangement faces two disadvantages. One demerit is that the costs of figuring, correspondence are more than past cancellable IBE designs. Alternate limitation is nonattendance of adaptability as in KU-CSP should maintain secret regard for individual customer. Here another cancellable IBE plot with cloud cancellation authority (CRA) to understand the two disadvantages in which the execution is by and large upgraded and the CRA has only a system puzzle for each one of their customers.

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